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This is one I see all the time and it's really annoying. You get on Facebook and see that one of your friends has 'Liked' an interesting topic. It may be something about a photo or a video and the title is always intriguing. Since your friend liked it, you decide to click on the link and it takes you to a page that forces you to also click the Like button before it shows you anything. After that, it takes you to another page that wants you to send messages to all your friends to also check out the page.
Most of the time, you never get to see what the title suggests, but you may have fallen for spamming all your friends. Sometimes you wind up being redirected away from Facebook.com and sent to another site, and that's where it gets dangerous. If you aren't paying attention, you might wind up installing malware or viruses you don't want because a popup window with an OK button says you must agree to something to see whatever the topic suggested. You could also be prompted with a fake Facebook login that amounts to a phishing attempt.
If you run across anything that requires you to click the Like button before it shows you anything, don't do it. The subjects will always be tempting and peak your curiosity, and that's how they get you. Tell your friends to quit clicking on that stuff, too.
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