Wallop - Microsoft and the social network

Maybe this is the sort of hook that trust-based search could leverage: Microsoft is apparently developing wallop, which leverages Instant Messaging groups and contacts for "social software" purposes. Not much detail available yet.
Read the following:

• Wallop homepage


• Will Microsoft Wallop Friendster - Wired article

Peter M's opinions about epinions have sparked my interest, I must check it out a bit.