Sully's been caught modifying his posts before. The Rittenhouse Review nabbed him (see here and here.)
I have my own loose policy on modifying posts. Roughly, anything up for less than 10 minutes is fair game for any modification, deletion, etc... This gives me time to see what the post looks like, fix typos, change a word here or there, and very very occasionally nuke a post I decide is, for whatever reason, crap.
Between 10-20 minutes I still feel free to fix spelling mistakes, typos, and do minor edits that don't in any way change the meaning. Over 20 minutes I'll put "UPDATE" to make it clear I've changed it, unless it is just fixing typos.
This is not a firm policy, of course, but a rough guide I try to follow.
I'd never wait four hours and change and/or delete the substance of a post without mentioning it.
UPDATE: links fixed.
