I just read an article on GigaOm about a small photo sharing app called Pixable. What they do is pull images from your relevant social feeds and present them algorithmically to you.
They apparantly are very sticky with engagement metrics that are.off the charts.
How this could be applied to games: (I’m sure between Raptr, Heyzap or someone they are doing this)
Scan folks twitter feeds or public feeds and note any game play. Present in a compelling or visual way, what is being played.
Where is the value? Ths value is in discovery of new games or finding out what friends play and to find that connection through games.