A facebook email/wall post written to you from a trap requesting that you see them in a social setting. A kind friend will usually comment on such a post with the words 'posting in trap thread' to remind recipient that they have been targeted by a trap.
Trap: Hey! We should totally do something friday nite!
Recipient of trap message: ok
Person 1#: Posting in trap thread
Person 2#: IT'S A TRAP
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Putting small bits of thread in the path of your opponent.
Let's set a thread trap so that we can time the guy who rides the large vacuum in our office.