Agreed. People spend a lot of time on Facebook, and most I know complain about its frustrating UX and ugly design. People aren't using Facebook's groups feature, so it's immaterial. Having a feature isn't good enough, it has to be broadly usable and ultimately, it has to be used.

It is true that Facebook may just copy the best innovations of Google+, but that puts them in a defensive position and obviously isn't what they want. We've seen what happens to giants who bank on leveraging their entrenchment in the current market.