Dennis
It also will send a alert to the other person that made the post that was liked. If your post is liked you will see that alert in the box located in the upper right of the screen next to your profile picture.
I didn't start using this feature until recently. But I think it's a great way of complementing someones hard work or agreeing with them 100% without saying the same thing someone else has said and continually bumping the thread.
And here I am bumping
I thought you might want to know that in case you didn't already.
Larry
