Twitter is now giving users the option to accept direct messages (DMs) from people they don’t follow. Until now if anyone that you didn’t follow on Twitter wanted to message you, they could send a public message with your Twitter name in it. So if someone sent a message to
@LarryMagid, I would see it if I were checking my own interactions with people (like lots of people do) but if they “DMed” me, by sending a direct message they would get back a note saying that you can’t send a direct message to users who aren’t following you.
Sending and receiving DMs are a bit like exchanging email, only with a 140 character limit.