Facebinge
A person who vanishes from Facebook for months and then comes back like a madman and comments on everything like it's a holy mission.
She hadn't been on Facebook in a year. Now she's commenting on my 2013 vacation photos like they're the last will and testament of the human race.
He hadn't posted in months. Now he's tagging me in every single post from 2012 and demanding I reply.
She hadn't seen her ex in years. Now she's commenting on every single post of his and calling him a 'piece of trash' in all caps.