Jon Fingas / Engadget:

Twitter is rolling out a filter that moves unwanted DMs containing questionable language or spam to an “additional messages” folder on Android, iOS, and the web  —  Twitter is quickly acting on plans to filter potentially offensive direct messages.  It’s rolling out the filter to all users on Android, iOS and the web.

Twitter is rolling out a filter that moves unwanted DMs containing questionable language or spam to an "additional messages" folder on Android, iOS, and the web (Jon Fingas/Engadget)
Source: Tech Meme