How to find out who is promoting the site?

come on owners actually advertised resources. Either advance or 100% have information who it is doing for them. Join the conversation, chide for the SPAM, a normal person will think again and will cease to do so.

Perhaps you have stolen FTP access and quietly inserted the links.
If the sites are the same then go to the owner of the site and vypilivaya who promotes, notifying that the site is promoting a fraudulent method.

If a website except you no one does so uniquely site hacking or theft FTP.
Did you give anyone access to the admin area of the site or FTP?

No one promotes.
Just one of the developers decided to earn some money (and posted specials. php code exchange links in templates/engine of the site). Or someone else got access to ftp/panel and put this code.
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To see who can try: EV in sape.ru to add a new project search sites in the keywords type in an address or text from the site, find the site number, and must contact the administration of the exchange to transmit data to place your website on the exchange.

Like a connected to your website exchange articles, check whether .strange htaccess directives.