Oh, by the way, "@" replies to you from Twitter display to you in your Twitter module. So yeah just in case you get responses to your tweets. We'd love to be able to work out better stuff with Twitter soon.
You can get comments. But we call it "reactions". You'll see a number of reactions to your update and clicking on it lists them out right on a page. Also if you get several interactions to your updates you get a notification email, so you know.