On a messageboard or anything similar, to browse the board very often, but without ever posting anything.

To read without commenting or contributing, therefore effectively invisible to the rest of the group or community. Generally recommended for joining any forum so that you can observe rules, attitudes and prominent personalities without jumping in and breaking a rule, making an ass of yourself, or asking a question about something obvious that you would have learned for yourself if you’d paid attention in the first place.

Online equivalent of attentive listening before speaking; potentially the solution to all Internet faux pas.

A person who, though standing with a group of "friends," fails to make conversation or say anything of interest. Commonly used as a derogatory term for someone quiet or untalkative.

When you look through someones profile, sometimes very repetively.

1.v action of sneakily creeping around in the shadows of a dark, dingy, underground location.
2.ad describing a specific type of dubstep
3.a particular state induced by ketamine
4.devon's only dubstep radio station

watching someone as though you're stalking them, but at a less degree.

To get in, and effectively ruin, someone else's photo. Can be whole body lurkage, or merely two fingers. Practiced by Bubbah in Germany.