A term used when one is tired yet cannot sleep so they mindlessly fill their Twitter page with nonsensical Tweets in order to rack up to a predetermined number or an even number if you are OCD or superstitious. Ultimately it is the equivalent of being bored enough to watching paint dry or watching grass grow.
Greg: What'd you do last night?
Mel: Shit really. Sat online mostly Counting Tweets all night.
Greg: Damn. There really wasn't anything poppin' in downtown?
Mel: Nope. Couldn't sleep either so it sucked hardcore.