The Thanks button is a nice way to show agreement or appreciation for a good post.
Each time you click the thumbs up icon (located in each post), you have the opportunity to leave a comment which the post author can read.
You can access your own thanks comments in your
user cp (click on user cp on the upper nav bar) and the last 30 or so will be displayed in the center section of the page under "Latest Thanks received" You can also see stats about how many times you've been thanked.
When you have been thanked you will receive a PM notification contain in a link to the details of the comment. If you do not wish to receive this notification you may disable that option in your user cp. >User cp >>edit options >>> Messaging & Notification. be sure to scroll and click save.
Spread the good vibe around, show your appreciation for a good post - give a little thanks