A like button would allow other members to show their gratitude for your post whatever it might be so that you can tell if you are post interesting stuff. If no one gives you a like it could mean your post sucks to whoever read it.
How many likes have you got?If we are going to make this a popularity contest, why not go all the way and ban everyone who doesnt get enough likes?
Hey, you have 5 likes and I only have 1...I just liked a post. I feel stoopid...