I'm going to pick each and every answer about merit point and list them here. You can help me by posting Question with there right solution and I try to list them here as soon as possible.
Q1. Where I can check who sent me the merit point?
Ans.
https://bitcointalk.org/index.php?action=meritQ2. Will deleting my post with merit points will also lead to the deletion of all the merit points?
Ans. No, The merit is not undone if the post is deleted.
Q3. How many merit point I can send to a single person?
Ans. You can only give 50 merit to a user in a 30 day window.
Q4 How many merit sources are there?
Ans. There are about 35 right now.