With Messenger, users can communicate, bring data with them, invite their friends...
...and their friends invite their friends, and...(you get the idea - huge network!).

Messenger Blog
Like Bing’s great multimedia search? Did you know other companies are innovating in the multimedia search space? Today Photobucket announced their own way to push the boundaries of visual search. They combined a killer user experience (based on Silverlight) with one of the most popular sharing behaviors on the web – instant messaging. Try it now at http://photobucket.com/visu....
Getting people to your website is critical (D’uh!). New people. Old people. A constant flow of sharing and content discovery is required to succeed. Recently I’ve been thinking a lot about two complementary user acquisition/engagement techniques: sharing via the stream (passive) and instant messaging (active) (I don’t cover email which is another huge topic). Which one has the biggest impact on....