New Twitter policy:

At both the Tweet level and the account level, we will remove any free promotion of prohibited 3rd-party social media platforms, such as linking out (i.e. using URLs) to any of the below platforms on Twitter, or providing your handle without a URL.

Prohibited platforms:

• Facebook, Instagram, Mastodon, Truth Social, Tribel, Post and Nostr
• 3rd-party social media link aggregators such as linktr.ee, lnk.bio

Examples:

• “follow me @username on Instagram”
• “username@mastodon.social”
• “check out my profile on Facebook - facebook.com/username”

Anyone who thinks this policy is even vaguely acceptable (or enforceable — good luck banning human cleverness at eluding regex patterns) can have Twitter. Enjoy it. What a goof.

Update: Late last night Twitter apparently rescinded the entire new linking policy. Steady hands at the helm.