The members of the Hetalia fandom that have made twitter accounts to roleplay as certain characters. It's mostly crack roleplay but you do get the rare serious roleplayer as well.
To collect information, passively or actively, on an individual using Twitter with the intent of using said information to meet (passively or actively) said individual in real life (IRL).
A conversation consisting entirely of 140 character-or-less "tweets", or Twitter updates, on the micro-blogging website, twitter.com. Twittersations rarely contain legitimate Twitter updates and are instead more of a slower form of instant messaging.
Jack: @Jill How was your Holiday?
Jill: @Jack It was great, we had lots of food and drinks! How was yours?
Jack: @Jill Oh you know, the usual! Lots of family friends came over. Wish you were there!
Jill: @Jack Wish I was there too, it sounds like a lot of fun. Did you hear what happened to Janet at the party?
Janet: @Jack @Jill She got pissed off when she got fifty twitter updates on her phone from a stupid twittersation.