Me Too
"And posting 'Me too!' like some braindead AOLer
I should do the world a favor and cap you like Ol' Yeller
You're just about as useless as JPEGs to Helen Keller..."
A person, who when replying to a message on a forum habitually says nothing more than "Me Too". Often on Fora such as email lists and Usenet, they will include the entire contents of the message they are replying to.
Roundly decried for wasting people's time and, in places without broadband, bandwidth. Some Fora, with borderline support for the site's monthly traffic, will ban posts like this just to keep the site up and running!
AOL's subscribers gained such a bad reputation for this after getting access to Usenet in the middle 1990s that the use of AOL! or the pseudo-HTML markup <AOL!> is a widely known shorthand for Me Too.
"+1" is a modern Web-2.0ish variant; while it is sometimes a legitimate idiom for "I agree this is important" , it is often used where it is not welcome.
A similar phenomenon is the poster who feels that posting the first response in a new discussion is a triumphant achievement, and will often post for nothing but the sole purpose of being that first response. Often followed up with cries of "second", "third" or "fourth" from other like-minded people who were a little too slow on the draw. This also applies to sites whose message boards have a pre-set limit on posts in a topic. When the topic is about to reach the post count where it will close, many posters will interject with meaningless posts just to be the one to 'kill' the topic.
Not to be confused with the international movement against sexual harassment and assault which took its name from the hashtag #MeToo which began circulating virally on social media in October 2017.