What I particularly like about the Wikipedia love button is that it will most certainly push all three major players to further refine their conceptions of what defines the social experience. Ultimately that will lead to the best possible online conduit for socializing.
Implications - City-life has fostered a level of disconnectedness -- from the natural world and from friends and family. The eco-movement has opened consumers up to the desire to connect. Companies that can find ways to enable meaningful connection and sharing will be poised to capture the minds of consumers.