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It’s really your own prerogative. Theoretically, if the OP considers that he’s got the answers he was looking for, or that the debate has reached a point where it is no longer productive, he may proceed to locking the topic (that’s assuming that the OP actually monitors the thread). Mods/Admins may also lock topics as per their own criteria (possibly after a report), which tends to be when they are just becoming too spammy.Personally, I’ve locked some of my threads, but most are I do leave open, lest one of them turns into a spam fest or is time sensitive.
I recall debates on Meta as to whether threads should auto-lock after a given period of time, or a given period of posting inactivity. The general feeling was, I believe, to let them be, since some topics make sense resurfacing after a few months or even a year (i.e. when events have taken place that make sense to continue a given thread). If they were to autolock, someone would probably create a new topic on the same matter in a squeeze. Ofcourse if they are necrobumped for no good reason, they should be reported (the necrobumber).
