In what way? Are people donating to the thread author or to the site? Is it for some kind of fundraiser where each thread needs a tally of how much is donated?
Thank you very much for your comment here. I can understand that my initial post is not very clear.
We would like to run some kind of competition where our customers can donate to the most famous thread. The more people donate to a thread, the higher the thread will end up in the ranking.