: I won't say Google has started favouring
G+ over others (except probably with the whole "Search Plus Your World" thing, and in which case I would say it is facebook and twitter's own choice). I think what we've been seeing more of is integration
of G+. They're not really forcing
people to use G+ in order to use Google products.
But if they force
people to use G+ to comment on Youtube, that would definitely be an act of favouring their own social network.