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.
There are also some options in your profile to control notifications associated with receiving a 'thanks"
Will the number of "thanks" appear on the post for others to see? I've seen other forums where you can see the amount of "likes".
2005 E350 Chateau - V10 - Agile Offroad 4x4
2012 CTS-V Wagon - For the baby...