A timeline of Google algorithm changes
Following on from last month’s post on keeping changelogs, we were asked if there is a public record of major Google algorithm changes over the past few years. If your site traffic goes up or down dramatically, it could be something you did or it could be the ranking algorithm that’s changed.
Happily, there is a handy record of algorithm updates over at SEOMoz. It only covers the bigger changes but it’s very useful nonetheless.