In January of this year, I noted that a number of externally published blogs, some externally hosted, others not, were subjected to an "Offsite Redirect" interstitial warning . For blogs published using FTP, to an external server, this is a righteous condition. Even if blog content is produced from Blogger and published to an external server, and the content is monitored by Google and scrutinised for undesirable content (hacking, porn and / or spam), that does not guarantee that the content of an FTP published blog will all come from the Blogger server. Any server that you FTP content to, from Blogger, you can as easily FTP to from a non Blogger source, and can add non Blogger content. Some non Blogger content could possibly contain hacking, porn, and / or spam. Spammers have used Blogger this way, in the past. Start with a BlogSpot URL, redirect it using external hosting, add spam directly to the external host. In that case, an "Offsite Content" interstiti