Is it Facebook's Prank or Virus?

I don't know why like that one lah... but if you click just want to see what is your friend post on the fb then don't know why it just a link going don't know where, after that you see your wall also don't know why and when you had share the link.... some time the link is just a article and is just a fake video. Just like this one " Graphic video.... Japan Tsunami Sends Whale" if you click and see what is that then all of sudden you turn into sharing it on your wall! Some say this kind of link is virus.... Whatever is that lah better watch out loh! Anything which is suspicious just careful a bit lah.. don't eat full full got nothing to do and click it!