Murdoch's move to buy MySpace has to be viewed as astute following the deal where Google sells ads and guarantee News Corp around $900m, depending on user numbers over a few years. In that context I think AOL's purchase has to be viewed as a good move.
I've written 100 times on how social networks need to be careful not to alienate their users by bombarding them with too many ads. Platform A looks like a loaded gun, ready to spray ads everywhere and cull Bebo's commendably modest one ad per page policy. That said AOL are very clued up on the commercial side of things in the UK after a few senior hires so I'm sure they'll get a sensible plan in place soon.