Twitter formalizes blocking of accounts and tweets that encourage readers to follow you on other social media sites, including Mastodon.

Specific examples of violating tweets given in the policy:

> “follow me @username on Instagram”

> “[email protected]

https://help.twitter.com/en/rules-and-policies/social-platforms-policy

Promotion of Alternative Social Platforms Policy | Twitter Help

Note that the following are *also* violations under the new policy:

* Circumventing the rule via technical methods (e.g. using a non-breaking space in the URL)

* Spelling out the handle explicitly (e.g. "I'm at username AT mastodon DOT social" is violation)

* Sharing a screenshot showing the handle.

@Pwnallthethings I wonder what about "I'm at username AT M."
@rrg @Pwnallthethings I think the phrase "I'm at" will soon be banned.