Facebook is quite a complex example of a walled garden unfortunately. In a way, it's more like a one-way mirrored garden. You can easily bring content *in*, but it's hard to let content *out*. And when we talk about wall, it has a couple meanings: 1) can't be seen unless you're logged in 2) can't be indexed by Google (more important to me than #1). I guess the main issue I have with Facebook is it's a garden where the plots have no markers. *Some* things are indexed on the public web. Others are not. *Within* Facebook, some kinds of content (e.g. notes) are very hard (impossible?) to search. - Richard Akerman