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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Egol echoes what I was going to write. Would you trust someone else with a major portion of your website?
What immediately came to mind was this MySpace incident with John McCain in 2007. http://techcrunch.com/2007/03/27/john-mccains-myspace-page-hacked/
It's often an internal link that's a bit screwed up that will cause this to happen. Look for a missing colon in http:, or something like that.
If you pull out dotbot from your exclusions, you should be fine.