Citation, Documentation of Sources

Q. How does Chicago treat Twitter handles? Do you lowercase (or capitalize) them consistently, or do you follow the user’s preference? For example, how would you style the following handles in a story: @roseannecash, @ElizabethHurley, @leannrimes.

A. It’s probably best to cap them the way they appear on Twitter, since that’s the way the owners styled them.

[This answer relies on the 18th edition of CMOS (2024) unless otherwise noted.]