Facebook Dislike Button: It's a Scam
It's a Trap! Facebook Dislike Button is Fake
If you see status updates in your friends' Facebook feeds touting a newly-installed "dislike" button, don't believe the hype. It's yet another scam. This one, like the ones that have gone before, try to bait you into filling out surveys and automatically spamming your soon-to-be-former friends with "I just got the dislike button, so now I can dislike all of your dumb posts lol!!!", along with a link to the rogue page, so the cycle can continue. Don't get pwned.
The Facebook Dislike button scam joins the growing pantheon of social-media social engineering, along with:
The scam points to FaceMod's Firefox add-on, which itself is not verified by Facebook. However, FaceMod is not behind the scam itself.
But you still haven't at this point been given a "Dislike" Facebook button, and the rogue application requires you to complete an online survey (which makes money for the scammers) before ultimately pointing you to a Firefox browser add-on for a Facebook dislike button developed by FaceMod.