Add the poster's handle

Warning²Federal courts, Illinois courts21st and 22nd editions

A social-media citation gives the poster's name and then their handle in a parenthetical; where the name is unavailable, the handle stands in its place.¹

1. 1R. 18.10.1 Social Media Platforms; R. 18.2.2(a) Author.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.