Twitter Eliminates The 140-Character Limit For Direct Messages

If you’ve checked your Direct Messages today, you may have noticed that something’s missing: The limitation of 140 characters. You can now chat in a single Direct Message, and likely still have some characters left over. While Twitter is largely a public experience, Direct Messages let you have private conversations about the memes, news, movements, and events that unfold on Twitter. This change is another big step towards making the private side of Twitter even more powerful and fun.
Twitter users can now exchange messages privately of up to 10,000 characters - with the idea being that Direct Messages should seem limitless! Twitter aims to improve users’ messaging experience to give them the real estate to express themselves more freely and getting rid of the 140 character limit is just another step in that direction.

Private messaging is definitely a core part of the Twitter experience, and earlier in 2015, Twitter launched Group Direct Messages, where multiple users could chat at once and any user could message another user privately irrespective of the fact that they might not be following each other. The aim of these changes is to help users connect more easily and directly on Twitter with other users, causes and businesses they care about most.

Mobile web users will be able to receive long DMs, but not send them. SMS DMs are still limited. If a user sends an SMS DM longer than 140 characters, Twitter will split it into multiple messages. While the first message will be sent as a DM in such a case, the remaining characters will post as Tweets.
Source: DNAIndia