Disturber - One who blatently, and knowingly incites riots and verbal confrontations in a message board community, in an attempt to disrupt the community with negativity. One in needing of attention. One who will, without thought, verbally attack another member of the community. Disturbers know what they are doing, and are looking for a reaction.
Troll - One who, more often than not, follows a Disturber from another board, and joins in on the "riot". Trolls also go from board to board and spam them with ads, email, or multiple posts, etc.
Dink - A "Dink" is a person who comes along and offers judgements and opinions about a person, place, or thing, but before doing so offers very little. A Dink is also a small Bassy, usually in the 15-20" range.