The kind kids at Facebook just released something very interesting: the ability to tag friends, events, groups, apps, and pages in status updates.
Additionally, they have decided to use the @ symbol to trigger the search dropdown. I think this is a very cool idea, and only improves the interaction between social graphs. It adds accuracy and interactivity to the stream.
Does it smell like Twitter to you? I don't think they are copying Twitter, just trying to catch up.
Check out the interesting commentary on Vaynermedia's Facebook page regarding this update.