> I achieved this by entering a greater than symbol (>) in the input field. Twitter presumably tried stripping any HTML tags, which resulted in an empty string.

> I achieved this by entering a greater than symbol (>) in the input field. Twitter presumably tried stripping any HTML tags, which resulted in an empty string. I'm not sure if this still works; they might have fixed that bug. I just tried it and got the following error: > Name can't include 'invalid characters' Note how it doesn’t define "invalid characters".