Which makes Facebook&#x27;s case interesting, since you can&#x27;t control through which UI your recipient will view your message.<p>I once had to reconnect with someone whom I only know how to contact via Facebook, and sent an email-style message broken into a few short paragraphs.  I did this in the &quot;full screen&quot; messages window, and later happened to view my sent message in the tiny chat box.<p>If I had received that huge message in a tiny chat box I would have had a very negative reaction: &quot;Ugh, what does THIS guy want and what&#x27;s he rambling about?&quot;