Perhaps "what are you searching for?" Messages posted and available to read through that interface will be to and from your Google Contacts. (That's the people you Gmail with, basically.) Google is making a big push for people to take their Google Profiles more seriously and one consequence of that could be a well populated social graph for users.
Friends could help answer the questions you're asking of Google or they could let you know what they are doing, like a home town version of Google News.
X. Song, B. Tseng, C. Lin, and M. Sun. Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, page 509--516. New York, NY, USA, ACM, (2006)