Twitter had been the only service to impose such a character limit. And Twitter has officially lifted its 140-character limit on direct messages. Users will begin seeing this change today across Twitter’s iOS and Android apps, Twitter.com, TweetDeck, and Twitter for Mac. All others should have this capability within the next few weeks.
In June, Twitter first revealed that it would no longer be capping direct messages at 140 characters. That limit has been increased to 10,000 characters. Originally the timeline was set for July, but obviously there was a bit of a delay. Since that time, Twitter has also made efforts to help developers prepare for this change, including giving them the ability to test their apps against an account called @LongDMBot.