TubeNet

I was wondering if it would be a good idea for threads in some parts of TubeNet, such as Off Topic, For Sale, or eBay to automatically expire and delete themselves after a period of time. Maybe if nobody replies to a topic after a month or two, the whole thread could simply be gone. I don't know if the software has a feature like that or if this is something that Sean would want to do.

I am, of course, in no position to grant or deny your request.

But I'm curious: why? At a glance, I can see nothing to gain by deleting old posts, and much to lose.
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Joe Baker, who remembers a number of old posts that have had very interesting second lives, and also finds reviewing old posts helpful.

Is there any way to configure that option at the time of posting?

If the topic/thread originator had a radio button that could be clicked that would give the post an expiration date (similar to the poll), this may be appropriate for the "For Sale" and "eBay" sections.