[alanctgardner2]

As far as I can tell the content of the update is never sent back. I just went on FB and started typing a status update. The status box expands, and loads some extra assets. But you can type and erase repeatedly and no extra HTTP requests are sent. I get the feeling their methodology was "Did the user request the status update assets? Did they subsequently post a status update?".

On the one hand, FB isn't doing anything evil. On the other hand, it shows how much clever stuff you can do by looking at people's intent based on information you already have.