Quoted from robin: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
I will add a line to the site rules that removing/clearing your post is not allowed. I will also make note about this on the post page. We'll see how it goes.
This sounds great to me. I like to edit the subject line of my requests for technical help to include [solved] for example.
Regarding new users, it seems to me it would probably be the regular uses that abuse the forum.