Avira is the latest in a recent spate of Facebook "Likejacking" scams doing the rounds.

The idea behind likejacking is to trick you into posting an update on your wall for a site you didn't intend to "like". It's a form of a broader attack known as "clickjacking".

The lure in the examples listed by Avira both involve the usual "look at this awkward thing involving sex". One is titled "Dad walks on Daughter...Embarrassing" and the other about an Italian TV star having problems with her dress:

You don't even get these alleged videos on your wall. You get the usual intelligence and relationship tests. Undoubtedly someone is making money off of these, which explains the whole point of the scam.

So anyway, be careful what you click on.