For those who never visited Spock, you entered an email address and it tracked you all over the web. Now it looks like Spock requires logging in to work.
Really, it's a matter of what you make available. I can't imagine "stalking" somebody ever really being a good use of time. What bad things are there to find? Drunken pictures? And that's on Facebook, behind a wall.
It's always fun finding 10-year-old, embarrassing news articles or pictures of someone. :) Also, if you're one of the many people who use MySpace instead of Facebook, those drunken pictures aren't behind a wall.
For those who never visited Spock, you entered an email address and it tracked you all over the web. Now it looks like Spock requires logging in to work.