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Forum Moderators: rogerd
I can only offer general ideas, no technical solutions.
IF you can filter out submissions by name, I would manually
determine which contributors are not worth reading.
Every group has those, it is up to you to make those decisions.
Some threads go around in circles forever. Those could be deleted
by topic or discussion name.
Some threads go wildly off-topic. Those could be deleted.
In all cases above, the oldest submissions get axed first.
Save all deleted postings offline. Archive disks or whatever.
Its dumb to endlessly keep tons of junk on your host ISP.
Best wishes - Larry
Doing so makes it much easier to search for what you want and has proven invaluable on my forums where information/suggestions/tips never get outdated.
If searching isn't important then in my opinion the next best thing is to archive posts that are older than whatever date you decide on.
1) Be sure the content is searchable by your members and visitors.
2) Be sure the content is appropriately linked and organized for easy search engine indexing.