Twitter users are now able to send and receive money, including Bitcoin, using Twitter's new "tipping" feature. All users age 18+ can enable tipping on their profiles, but tipping options vary by location.
All Twitter users with tipping enabled will be able to display a Bitcoin address on their profiles, but only users in the US (excluding Hawaii and New York) and El Salvador will be able to send Bitcoin directly to each other. Twitter has integrated Strike, a third-party consumer app operating on the Bitcoin Lightning Network for handling Bitcoin transactions.
Twitter collects no fees from tips, but most of the apps it has integrated do. Along with Strike, Twitter has integrated Bandcamp, Cash App, Patreon, and Venmo.