I haven't seen one, but I have asked Andy about the possibility of chat being added to the site. This would only show those who we are interested in, but would show if they are online, and allow us to have a little more of the offline chats, like we have been trying to minimize recently. Also, those wouldn't show up in the history for things people are trying to search. Seems like it would ge a good addition along the social lines, and could be used for both directly travel and less travel related discussions between 2 users. I have also suggested group chats between several users would also be nice.