Just because someone else did it doesn't make it something that's allowed. There's a good chance that a mod saw and deleted their post/gave them a warning.
Moon, this is Rule #30 from the chatbox rules: All Chatbox content related to Advertising of any type (except RPs), or links to anything For Sale/Breeding/etc belong in the Sales Chatbox. Veiled Advertising is not permitted in the Main Chatbox.