We know Google is constantly making changes to their search engine, from user interface changes, ad changes, web spam and core search changes and much more.
Today in a Google+ Hangout, John said that Google makes thousands of updates to their search algorithms each year.
He said, this at the 2:47 minute mark into the video:
Essentially this (Google core algorithm updates) is something we do all of the time. We make thousands of updates in our algorithms every year.
Here is the video:
This shouldn't come as a surprise to any of the readers here, as we cover hundreds here all the time. Plus when Google was documenting their changes, there were dozens and dozens per month done, most are small tweaks that most of us wouldn't pick up on.
But John said, Google does thousands of algorithmic changes per year.
Forum discussion at Google+.