Hey shabbir,
I have noticed in some forums (specially torrent ones) there is a "Thank You" button which people click to thank the author for there article/upload.

One good thing i have noticed is, a lot of times user doesn't have that much to say, or is in a hurry to read other articles or not in mood to type something, this is where these thank you buttons come in handy. With this feature, authors will get more acknowledgment and encouragement as more people will thank them and they won't feel there articles were not appreciated even though it had so many views.

I am attaching a screen-shot from one of the sites to give you an idea of it.
Attached Images
File Type: jpg thankyou.jpg (10.6 KB, 9 views)
naimish, shabbir likes this