The most prominent one actually does eventually actually lead to the dislike button. However, this is a free Firefox addon. You can download it for free, as the author intended.
Unfortunately the scammers decided that in the process of leading you to this addon, they would make you install a facebook "application". This of course can read all the data, and your friends data, you've allowed it to (which is most cases, is pretty much everything!).
Facebook's applications are notoriously privacy invasive. Ensure your settings don't allow them access to anything (especially those that your "friends" install!).
So many people want a dislike button they would do anything for it.
I wished there was a dislike button but I am not going to download an add-on so I can have it even if the original addon is fine and safe from viruses.
Some people can get tricked into giving anything away, this is no different then the emails or other stuff we get to trick us into downloading something of the virus nature.
yeah i've seeen that scam before, kinda almost fell for it the first time but then i was like wait- wait-----nooo! scam! haha. i think FB should offer the people the option of showing a dislike button when they post their status.
See i knew it could be only a scam once i heard there was even thoughts of one, if you don't like it you must not like it, so no point in a dislike button. it's very easy to tell that was a scam