I agree that his argument is flimsy at best, but why do you only associate Coke and Pepsi products with brands?

What about rock bands, video games, movies, radio stations, operating systems, charity groups, regional festivals, political parties, etc., etc.?

I think most people are emotionally invested in at least a few of these kinds of non-person entities and it's not unreasonable to think that they would like to follow them on G+.