Code:
<iframe width='100%' height='100%' src='http://refer.ccbill.com/cgi-bin/clicks.cgi?CA=937140-0000&PA=1849133&HTML=http://www.theappletwins.com/'></iframe>
As well it links to directlinkq.cn which is blocked in Firefox for being a phishing site.
Looks like these guys are using your site as a front to get installers downloaded or to capture user information. The affiliate link they are using above is the CCBILL affiliate account they appear to be using.
Merry Christmas.
