50 posts to affect others rep.
Every 30 days, you will receive one block of rep.
Every 100 rep points you RECEIVE, you'll get a block of rep.
Every hundred or so posts you make, and you'll get one block (spamming for reputation will result in you losing your rep powers and or get -1000 rep).
You can only rep 10 people a day.
You can only rep 20 different people to rep the same person. Example: I rep Muigi for 5. I can only rep him again after 20 others.
You can only rep if you have a green block. Red or gray blocks will have no affect on ANYONE.