Rating posters and giving them credit

[Camel Toe]

1. How many rep points do you need to get 2 green blobs?

100 seems about right.

2. I can only approve or disapprove posts - not give a specific number of points - is that how it should be?

Yes...

3. What is a purple?

A person whose reputation is so low they can't dish it out as such... someone like Harry or LDMA.

That's great! Harry or LDMA, side by side.

What about that number we see on the right in CP? I take it as a sum of the repo power of a poster tallied up? Say a poster has 10,000 points, if he greens a bloke with 100 points that tally goes to ??