Moderated? No they are routinely not, UNLESS the post trips the Spam Filter program.
We get false positives on occasion, which THEN requires Moderator intervention to clear them. Usually within moments (depending on time of day) of initial posting.
Other potential causes for moderation is if a member
reports a post OR if Moderators happen to view new posts requiring attention.
Modified? On occasion manually, if obvious subject line typo's, duplicates, wrong section or found to be not in accordance with forum rules (offensive, sexist, SPAM, etc).