A few years ago, in that way Google was telling about backlinks profile, and continued to maintain a corporate template answers, like "you need to focus on content, and people will find your website". The fact is, that he recognizes that such factor exists and Google considers this data.
And social signals - absolutely are a ranking factor, and one of the most unambiguous.
https://www.youtube.com/watch?v=ofhwPC-5Ub4
Google even say, that they kinda try to figure out a little more about the reputation of an author or a creator on Twitter or Facebook