Yes, I know this is not scientific proof. I said "some test results", this is SEO, everything is theory / best guess. There are too many variables, which cannot be controlled by anyone other than google. What I provided was something to back up my statement.
How did you come to this conclusion?
I agree with you the only feasible way to "reverse-engineer" the algorithms is by doing these kinds of tests, but at the same time they're pretty much worthless as proof. Especially when it's coming from sketchy second-hand source like that.
Furthermore these experiments aren't needed because anyone actually following Google closely (as any serious SEO should do) knows that it's already public record that social signals are not a ranking factor.
For example, here is a clip of Matt Cutts stating at last year's SMX that Google +'s are not a ranking factor:
https://www.youtube.com/watch?v=qglAm8QiX5k&t=38m34s
Unfortunately he didn't really spill the beans on other social platforms. However, John Mueller said in a Google Hangout video a couple of weeks explicitly stated that social signals are not a ranking factor. BOOM.
Hi Tony, I always like to see you post something about PBN, do you rebuild old content or use fresh article when building PBN?
Don't underestimate them. I think they can.
http://www.webpronews.com/google-bing-identity-like-farms-2011-09
That was almost 4 years ago and they have gotten better.
LOL like Google can tell the difference between real and fake likes/tweets (no they can't) do you have any idea how much extra computer power that will cost to figure that out, you do understand that Google is a business and if apparently very good at making people belief it can see/know everything you do, they can't..... Not by a long shot, and people who do real test know they can't.
So yes social signal are important to justify your backlinks, no google cant see the difference between real and fake tweets/likes, don't belief me test it yourself and see if there is any difference in ranking with fake or real social signals.