I'm a member of many freebie sites. A legit and reputable company will not friend request or contact you on Facebook. If you win something or they need to contact you for something, they will send you an email. A professional email. Emails claiming you won all of these outrageous prizes are not real. The only way to win a prize is to enter to win it. If you didn't enter a contest to win a billion-gazillion dollars, then don't open an email saying you won. Keep track of what contests you enter and when the contest ends. Then you'll know what emails you should be receiving if you've won. Just use common sense. Read the details of the emails, and who they are from. When in doubt, contact the company and verify the email and details therein.