If you want to get a thread back to the top of the new post list you BTT of bump this thread to bring it back to everyones' attention. Saves people from having to search for it if you feel it is worthy of a new look!
Bump means you are replying to your own post and "bumping" your ad back to the top of the page. Another short version also is "BTTT" which means back to the top of the page. Cob Classifieds Moderator