Firstname Bunchofnumbers

Etymology
When someone attempts to register a Twitter account name that is already taken, the site suggests the inputted name followed by a long, randomly-generated string of numbers as an alternative (e.g. "@Wiktion74587432" instead of "@Wiktionary"). This has led to many anonymous accounts with handles that consist of a given name and a string of numbers (e.g. "@Jane74587432675").

Proper noun

 * 1)  A Twitter user suspected to be a troll, sockpuppet, or bot due to having a default-style account name and a history of odd, tendentious, or offensive posts.