Earlier this week, Twitter started rolling out its new 10,000 character limit for Direct Messages, ditching the old 140 character limit. Now the popular Windows and Windows Phone third-party Twitter app Tweetium has been updated to support the much longer texts for Direct Messages.
The 3.6.4 update also has some improvements for transitioning from offline to online mode, along with a few minor bug fixes. However, the ability to DM with your friend with much longer text messages in Tweetium is certainly going to be a big deal for the app's loyal users.
Thanks to Kristoffer for the tip!