Guys, I'm very disappointed. I posted a "hidden" tracking URL on a blackhat forum as part of a ranking Case Study, and 2 days later someone pinged me on Skype saying Serpbook had exposed the URL and Keywords as a glitch. Using that, any blackhatter could have reverse-lookup'd my other websites and potentially Neg SEO'd my sites (they're in a competitive niche) - or Google shills could have reported my keyword+URLs and subsequently had all my properties taken down. What's the meaning of this? How frequently does this happen? Please give me an honest and straight answer so I can consider whether to ever use the "hidden viewkey" feature ever again.