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1.
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)?"
by Amber Spyglass October 13, 2007

Words related to necrothread

blog comment board internet usage interweb necro-thread