UPenn librarians making IM friends

For a long time, I've been lurking on the RSS feed for the blog for library staff at the University of Pennsylvania and was amused today to read this post about an exchange a librarian had with a student on the library's IM service.

By the way, if I am reading a blog feed that is clearly not aimed at me but rather at a small group of people who work together, is it accurate to call me a "lurker?" A "busybody?" Or maybe just "plain curious?"