Last.fm acquired for $280 million by CBwho?

Techcrunch just reported that CBS has acquired the awesome music community/social network – Last.fm for $280 million cash. That’s great but why CBS? They picked up Wallstreet and now this. Evidently, online media communities is a priority to this once-lumbering giant, but I wonder if they give a crap about communities. I am glad that at least they are leaving the team behind Last.fm in place to keep the good times rolling.