As much as I hate giving kudos, to social media, I use twitter, for political talk, does not make me a dime, however, the G accepting signals from Social Media, is really an extension of it behavioural work in the pre-existing algos anyway. And it makes perfect logical sense, on so many levels.
At the end of the day, G has to go where the sheeple are hanging out, in order to make more dough.