The Wall Street Journal reports Apple just bought Topsy, a social media analytics company, instantly giving it a world of social power. The WSJs Daisuke Wakabayashi and Douglas MacMillan report Apple recently purchased Topsy Labs Inc., a social analytics firm, for more than $200 million. Apple has struggled to adapt socially — its iTunes Ping service shut down last year to no mourning. The biggest move Apple made was integrating Facebook and Twitter into its iOS platform. And so, with no previous indication Apple would try and play socially, the question becomes, Why Topsy — and why now?