Social signals are good for you SEO rankings right?
So I was wondering can't this easily be faked? There are sites like addmefast or bighits4u that offer you the opportunity to exchange social signals. You like someones page, post, follow a person and in echange you get credits.
You can than spend those credits to do the same for your own sites/pages.
You can than easily let people like your site, ore share your site on facebook, twitter, google plus and others. Would this also improve your rankings or does google know about this?