Dear Webmaster,

It's a sad story.

A malicious competitor, or a hacker out to cause trouble, builds some "unnatural links” to one of your sites.
And because of the recent changes at Google, your site disappears from their search results, never to return.
Couldn't happen? Not very likely, you say?

Don't be too sure.
Listen...
The Penguin update has opened up a whole new can of worms, and your sites may be vulnerable...even if you think you're doing everything right.
Sad, but true.