We have a new policy for editing of old posts and, more specifically, the time frame in which you are allowed to do so.
The reason for this is that we are seeing a lot of people editing old posts, topicstarts, topic titles and emptying them. We are sometimes seeing topics where all content from a user has been stripped out, leaving an undecipherable mess that no longer has value to the site. This is not only bad for the site but it could potentially allow bad people to cover their tracks.
So what are the new limits? Note that these are still subject to change:
Site staff (like moderators) - Can edit *all* posts, forever
Regular users - Can edit their own posts for 4 hours
New users - Can edit their own posts for 1 hour
Regular users can edit their opening posts for 24 hours.
After plenty of discussion I have not yet reached a final decision. For now, the limits are like before until I get more time to think about this
New Pinside users
Opening post: editable for 2 days
Normal post: editable for 8 hours
Regular Pinside users (you become a regular based on karma / time you are a member)
Opening post: forever editable
Normal post: editable for a year