Twenty percent of the world's population is "on" Facebook—that's well over a billion people

Top 10 Most Popular Facebook Scams

1. Profile visitor stats. It's all about vanity. It doesn't take long for any new Facebook user to see an ad offering to reveal how many people are viewing your profile. You can even find out who's viewing. It must make a lot of FB users feel validated to know how many people are viewing them and just whom, because this scam comes in at the top.

   Is it really that important to know how many people are viewing your profile? Even if your self-worth depends on this information, Facebook can't provide it. These ads are scams by hackers.

2. Rihanna sex tape. What a sorry life someone must be leading to be lured into clicking a link that promises a video of a recording star having sex. Don't click on any Rihanna sex tape link, because the only intimacy you'll ultimately witness is a hacker getting into your computer.
3. Change your profile color. Don't click on anything that relates to changing your FB profile color. Facebook is blue. Get over it. You'll never get red, purple, pink, black, grey, white, red, orange or brownish-magenta. Forget it. Deal. If you see this offering in your news feed, ignore it. It's a scam.
4. Free Facebook tee shirt. Though this offering seems quite innocuous, anyone who never rushes to click things will realize that this can't possibly be legitimate. Do you realize how much a billion tee shirts cost? Even if you don't know that one-fifth the world's population uses Facebook, you should know that an enormous number of people use it and they aren't getting a t-shirt.
   1. Where would Facebook get the money to 1) produce all those tee shirts (even if one-tenth of FB users wanted one, that's still a LOT of money), and 2) mail the shirts out, and 3) pay reams of people to package the shirts and address the packages? People, THINK before you click!
5. See your top 10 Facebook stalkers. This is just so funny, how can anyone take it seriously and be lured into clicking it?
6. Free giveaways. It's cliché time: Nothing's free in this world—certainly not on Facebook. End of story.
7. See if a friend has deleted you. This, too, sounds suspicious. And besides, is it really that important if a "friend" has deleted you? Do you even personally know every individual who has ever friended you? This feature does not exist. You're better off pretending that nobody would ever want to delete you because you're so special! But actually, there are plug-ins available that perform this function, but still, stay away.
8. Find out who viewed your profile. Again, here's a scam that works well on people who have too much time on their hands. This function doesn't exist on Facebook.
9. Just changed my Facebook theme and it's rad! Ignore this at all costs.
10. Tragedy of the day. Whenever there is something horrific going on such as Mother Nature getting all murderous or some manmade disaster or even a celebrity dying, you can be sure Facebook scammers are on top of the breaking news with a "video" or "photo" that simply isn't. Just don't click it.

Robert Siciliano is an Identity Theft Expert to Hotspot Shield. He is the author of 99 Things You Wish You Knew Before Your Identity Was Stolen See him discussing internet and wireless security on Good Morning America. Disclosures.