MMORPG – Massively multi-player online role-playing game
MUD – Multi-user domain
SNS – Social Network Site
IRL – in real life
F2F – Friend-to friend (closed) network or Face to Face
Flaming – a message sent over the internet with the deliberate intent to insult (source Wikipedia)
Troll – someone who posts inflammatory, extraneous or off-topic message in an online community, such as an online discussion forum, chat room, or blog with the intent of proviking readers into an emotional response. (source Wikipedia).
Netiquette -internet etiquette, social conventions that may or may not be adhered to when online.
Blogosphere – is the collective name for all blogs on the internet.