A lot of site owners still ask me whether swapping links with other websites is safe. "You link to me, I link to you, we both win." It sounds harmless. In the early 2000s it was one of the most common SEO tactics around, with whole directories of "link partners" and software to manage the swaps.
The Bourbon update of May and June 2005 is one of the first moments when that tactic clearly started to backfire. It is also remembered for two other things: problems with duplicate content and the old "www vs non-www" issue, and the fact that a Google representative talked about the rollout while it was happening, which was unusual at the time.
Let me explain what is documented about Bourbon, what was only reported in the forums, and how you should handle link exchanges and duplicate URLs today. You can see where Bourbon fits in the bigger picture on our Google algorithm updates timeline.
Bourbon at a glance
| Item | Details |
|---|---|
| When | Late May into June 2005 |
| Type | Named ranking update, focused on spam and quality |
| Confirmed by Google? | Yes, informally. "GoogleGuy", Google's forum representative, described the rollout as it happened. |
| What Google said | Bourbon included "something like 3.5 improvements in search quality", rolled out over about a week or two |
| Reported targets | Duplicate content, canonical URL problems (www vs non-www), reciprocal and off-topic link exchanges, unnatural link growth |
| Reported victims | Link-exchange-heavy sites, sites with duplicate URL versions, and some legitimate publishers caught by collateral damage |
| Forum reaction | A WebmasterWorld thread on Bourbon's consequences reached 82 pages and 1,225 posts by 27 June 2005 |
How GoogleGuy talked Bourbon through in advance
Before Bourbon, Google mostly let updates happen and stayed quiet. Bourbon was different. GoogleGuy, an anonymous Google employee who posted on WebmasterWorld, explained how many changes were coming and when they would land.
John Battelle quoted him on his Search Blog on 1 June 2005:
“The 0.5 will go out in a day or so, and the last major change should roll out over the next week or so.”
— GoogleGuy, quoted by John Battelle’s Search Blog, Google Update ‘Bourbon’
In the same post, GoogleGuy said Bourbon "includes something like 3.5 improvements in search quality" and that "only a couple are out so far". He also gave advice that is still good today: "take a break from checking ranks for several more days", because rankings "may still change somewhat over the next several days".
That might sound minor, but it was a real shift. For the first time in a major update, site owners had a rough schedule from Google itself. It is an early ancestor of what Google does now, announcing core and spam updates and listing them on the Search Status Dashboard. I explain why that difference matters in our guide to confirmed vs unconfirmed updates.
A small note on the name: one commenter on Battelle's post remembered that Danny Sullivan named it Bourbon in connection with an event in New Orleans. That is unverified. If naming history interests you, see our post on who names Google updates.
Duplicate content and the www vs non-www problem
GoogleGuy did not list what the 3.5 changes were. So, as usual, the SEO community worked it out from the damage. The biggest discussion happened in a WebmasterWorld thread called "Dealing with the consequences of Bourbon Update". Barry Schwartz at Search Engine Roundtable summarized its "survival kit" on 27 June 2005. The first item tells you a lot about what people were seeing:
“Do a 301 redirect regarding yoursite.com vs. www.yoursite.com (canonical url problem).”
— WebmasterWorld member reseller, quoted by Search Engine Roundtable, Bourbon Update Survival Kit
Let me explain that in simple words. Many sites in 2005 could be reached at two addresses: example.com and www.example.com. To a person they are the same site. To a search engine they could look like two separate sites with identical content. Links got split between them, and Google sometimes picked the "wrong" version or treated pages as duplicates.
The survival kit also suggested removing 302 (temporary) redirects, removing duplicate pages, and submitting a Google Sitemap, a program Google had launched around that time. Taken together, these point to Bourbon being stricter about duplicate URLs and duplicate content, whether on purpose or as a side effect.
How Google handles this today
The good news is that this problem is much easier to fix now. Google's documentation on duplicate URLs lists three main ways to tell it which version is the main one (the "canonical" version):
- Redirects, which Google calls "a strong signal that the target of the redirect should become canonical".
- The
rel="canonical"link tag, also described as a strong signal. - Listing the URL in your sitemap, described as "a weak signal".
Google adds that these methods "can stack and thus become more effective when combined". Its ranking systems guide also says canonical markup helps it identify the primary page when content is duplicated. Our guide to the canonical tag shows how to set it up, and our post on duplicate content causes and fixes covers the wider topic. If you are just starting out, the free lesson on canonical tags explains it from scratch.
Reciprocal and off-topic link exchanges
The other big story around Bourbon was links. Bruce Clay's update history describes Bourbon simply as "another big change to the algorithm that was focused on getting rid of spam from the index". Many later summaries, including the angle in most update histories, single out reciprocal links and non-thematic links (links from sites on unrelated topics) as targets.
I should be honest: Google did not say this in 2005, and the sources I could open from the time do not quote Google on reciprocal links. The evidence is the pattern people reported. Here is how a typical 2005 link exchange setup looked:
- A "Links" or "Resources" page with 100 to 500 outbound links, often split into many sub-pages.
- Partners from any industry, because any link was thought to pass PageRank.
- Three-way swaps (A links to B, B links to C, C links to A) to look less obvious.
- Automated software that checked whether partners still linked back.
Sites built mostly on this kind of linking reported big drops after Bourbon. That fits a direction Google had been moving in since the Austin update of 2004, which reportedly hit off-topic link swaps, and the Brandy update, which seemed to favor links from related sites.
Today there is no ambiguity. Google's spam policies list "excessive link exchanges ('Link to me and I'll link to you') or partner pages exclusively for the sake of cross-linking" as link spam. The key word is excessive. Two related businesses linking to each other because it helps their customers is normal. A page of 300 swaps is not. Our guide on when link exchanges become a problem draws that line in detail.
Collateral damage: legitimate publishers caught in Bourbon
Not everyone who dropped was a spammer. One of the more interesting voices from the time is a reader comment on Battelle's post, from 2 June 2005. The commenter said that "a number of legitimate publishers who have coasted unharmed through every previous update" were "slashed badly in this one". These were content sites that had ranked for years, updated regularly and did not use SEO tricks.
His theory was that Google was trying to catch sites that added a huge number of incoming links in a short time, and that legitimate sites with lots of links from scraper sites were caught by mistake. He also said GoogleGuy had stated that "unnatural link growth" would not help rankings, though that is a secondhand claim.
I treat this as one person's view, not data. But it shows a pattern that repeats with almost every link-related update: a filter aimed at manipulation also catches some innocent sites, usually because of links they did not build. That is one reason Google today mostly ignores spammy links rather than punishing the target, and why the disavow tool exists for the rare cases where it is needed.
A worked example: cleaning up a Bourbon-era site in 2026
Here is a hypothetical example. A small travel insurance comparison site launched in 2004 still carries some old habits. Here is what an audit might find, and what I would do.
| Issue found | Example numbers | Action | Priority |
|---|---|---|---|
| Both www and non-www versions load | Search Console shows 1,800 pages indexed across both hosts | 301 redirect non-www to www (or the reverse); set canonicals; update sitemap | High |
| HTTP and HTTPS both live | Old HTTP pages still return 200 | Redirect HTTP to HTTPS; Google generally prefers HTTPS as canonical | High |
| "Partners" page with link swaps | 220 outbound links, about 80% unrelated to travel | Remove unrelated links; keep the few genuinely useful partners | Medium |
| Printer-friendly duplicate pages | 350 ?print=1 URLs indexed | Canonical to the main page or remove the print URLs | Medium |
| Old 302 redirects for moved pages | 45 permanent moves using 302 | Change to 301 | Low to medium |
None of these fixes is exciting, but each one removes a signal that Bourbon-era SEOs were fighting in 2005. If you suspect a link problem has already turned into a penalty, our penalty recovery service can check for manual actions and plan a cleanup.
Bourbon's lessons for link building and site hygiene
Here is what I take from Bourbon, in short:
- Pick one version of every URL. www or non-www, HTTPS, trailing slash or not. Redirect the rest.
- Links should make sense to a reader. If you would not link to a site without a swap, the swap is probably not worth it.
- Volume is not value. A page of 300 partner links did not help in 2005 and is listed as link spam now.
- Do not panic during a rollout. GoogleGuy's advice to stop checking ranks for a few days still applies to every update.
- Some damage is collateral. If you did nothing wrong, focus on quality and wait for later updates before making drastic changes.
For a broader look at how link signals have changed since PageRank, read our post on link analysis, PageRank and Google updates.
Questions people ask about the Bourbon update
Did Google confirm the Bourbon update?
Informally, yes. GoogleGuy, Google's forum representative, said Bourbon included something like 3.5 search quality improvements and described the rollout schedule. Google did not publish what the changes were.
Did Bourbon target reciprocal links?
That is how the SEO community and later histories read it, based on which sites dropped. Google did not say so at the time. Today, Google's spam policies do list excessive link exchanges as link spam.
What is the www vs non-www problem?
If a site loads at both example.com and www.example.com, search engines can treat them as two copies of the same site, splitting links and causing duplicate content. A 301 redirect to one version and canonical tags fix it.
Are link exchanges always bad now?
No. Occasional links between related businesses that genuinely help users are normal. Google's policies target excessive exchanges and partner pages that exist only for cross-linking.
How long did Bourbon take to roll out?
GoogleGuy said on about 1 June 2005 that the remaining changes would roll out over the next week or so. Forum discussion of its effects continued through June 2005.
Where to start if your site still has Bourbon-era habits
Bourbon rolled out over late May and June 2005, with GoogleGuy describing "something like 3.5 improvements" as they went live. Forums tied it to duplicate content, canonical URL problems and link exchanges, and some legitimate publishers were hit too. Google never listed the changes, but every issue people blamed is now covered clearly in Google's documentation.
The next chapter is the Gilligan "update" of September 2005, which turned out not to be an algorithm change at all. Later that year, the Big Daddy update rebuilt Google's crawling and indexing infrastructure, which is where canonical URL handling was discussed next.
If you want someone to check your redirects, duplicates and link profile, our SEO team can run a full audit. Just get a quote and tell us about your site.
Google updates around the same time
Before this update:
- The Allegra Update (February 2005): The Sandbox, LSI and Suspicious Links (Feb 2005)
- The Brandy Update (February 2004): Bigger Index, LSI and Link Neighbourhoods (Feb 2004)
After this update:
- The Gilligan Update (September 2005): The 'False' Update and PageRank Refreshes (Sep 2005)
- The Jagger Update (2005): Google's Three-Part Attack on Link Schemes (Sep 2005)
Or browse every Google update on one timeline, newest first.
Sources for this Bourbon update history
- John Battelle's Search Blog: Google Update 'Bourbon' (1 June 2005)
- Search Engine Roundtable: Bourbon Update Survival Kit (27 June 2005)
- Bruce Clay, Inc.: Google Updates: A History of SEO from 2000-2010
- Google Search Central: Spam policies for Google web search
- Google Search Central: How to specify a canonical URL
- Google Search Central: A guide to Google Search ranking systems
- Wikipedia: Timeline of Google Search
- Search Engine Roundtable: Google Update History Documented (2011)
