Definitions by Amber Spyglass

necrothread 

Negatively: an old, decaying thread that refuses to die.

Positively: a threaded conversation that had retained its usefulness so long that new comments are still being added years later.

Example relates to both definitions.

Example of a necrothread: "Where's the best place to meet people in (insert city here)?"

necrothread by Amber Spyglass January 4, 2009