Twitter introduces DM changes

Memeburn reports that Twitter now let's you receive direct messages (DMs) from people you aren't following; and, in what seems to be an effort to combat spam, the micro blogging site's users can no longer include links in DMs, reports ReadWrite.

For more:

Memeburn: Twitter now lets you receive DMs from people you're not following... The report states that you no longer have to follow someone on Twitter for them to send you a direct message. This option however, is off by default, so you'll have to activate it yourself.
ReadWrite: Twitter's Direct Messages, a vehicle for spam, no longer accepts links... According to the report, this could be a result of Twitter's move to broaden the range of accounts that can send each other direct messages and could thus be an effort to combat spam.