Twitter blog:

As part of our ongoing efforts to build tools with privacy and security at the core, we’re updating our existing private information policy and expanding its scope to include “private media.” Under our existing policy, publishing other people’s private information, such as phone numbers, addresses, and IDs, is already not allowed on Twitter. This includes threatening to expose private information or incentivizing others to do so.

And:

Sharing personal media, such as images or videos, can potentially violate a person’s privacy, and may lead to emotional or physical harm.

And:

While our existing policies and Twitter Rules cover explicit instances of abusive behavior, this update will allow us to take action on media that is shared without any explicit abusive content, provided it’s posted without the consent of the person depicted.

If you use Twitter, worth reading this whole blog post, to get a sense of where this policy is going, what types of tweets it covers.

This is a difficult enforcement road, as it opens the door to false complaints (think YouTube and misuse of DMCA takedowns). Definitely good to be aware of.