That's what I wonder about. Someone could write a facebook ad that links to a captcha test, and then post results. That would provide some useful results...

That's what I wonder about. Someone could write a facebook ad that links to a captcha test, and then post results. That would provide some useful results... I should also mention that my targeting is news feed exclusive. In the past I've used sidebar ads, but their results are garbage compared to news feed ads.