[lawlit]

I do care, this shows that Mark is following G+ moves, wich also can indicate that Mark is acknowledging the fact that G+ is a direct competitor to FB. and also, You can prove it yourself : 1) Add Mark to a circle. 2) You will see him popup in the list of people in your circles who have played the game

[RuadhanMc]

The only thing this indicates is that Mark is keeping tabs on the latest hot news. It means that when a reporter asks him the question "Do you think G+ is a competitor to Facebook?" then he can give answer. The answer could be a simple no, but unless he's actually used G+ how could he honestly answer that question?

[smoyer]

But you also need to prove that the Mark Zuckerberg account on G+ is THE Mark Zuckerberg.