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"We deeply care about the people who are generating high-quality content sites, which are the key to a healthy web ecosystem," Singhal said.
"Therefore any time a good site gets a lower ranking or falsely gets caught by our algorithm - and that does happen once in a while even though all of our testing shows this change was very accurate - we make a note of it and go back the next day to work harder to bring it closer to 100 percent."
"That's exactly what we are going to do, and our engineers are working as we speak building a new layer on top of this algorithm to make it even more accurate than it is," Singhal said.
I noticed during this time that about 20% of my keywords weren't showing up in the SERPs at all, and the rest went from around page 1 or 2 to 9+.
Twitter links don't matter, they're nofollow.
But are either of the major search engines actually using those social signals to rank regular search results? A bit, they tell me. In particular, your stature on Twitter could help influence how a page ranks in web search.
Authoritative people on Twitter lend their authority to pages they tweet.
I heard second-hand today from a representative for a major ad network that a number of his clients who have long-standing sites with original content that were initially hit are experiencing a rebound. I suspect that Google is either refining its test for what site should get credit for initiating content or partially rolled back the changes to that algorithm.
Sometimes the cached date can even move backwards in time.