Historical clue formulations

• Handle online — 2024-10-05
• Entry requirement, often — 2022-10-07
• @ follower, on Twitter — 2021-09-29
• POTUS in Twitter's @POTUS, e.g. — 2017-01-18
• Avatar accompanier — 2014-11-21
• What an anonymous person may lack — 2014-08-07
• Creation for many an account — 2013-12-07
• Connection requirement, at times — 2013-01-12
• Common admission requirement — 2012-03-17
• Surfer's handle — 2011-06-30
• Chat room info — 2007-01-20
• Start of certain addresses — 2001-02-16
• Requirement for access, maybe — 2000-10-13