I am a spreadsheet dork! I have everyone's weights from the initial weigh in, and then from each week. I keep track of that. Then each week I calculate the weekly % change, and that's all I post. Ironically, nobody wanted to share their weight, so I just post the % change ... but most people are posting their weights on their own! lol
Anyway, I also track total weight lost, and total % lost as the weeks go by ... as well as total lost and total % lost for the group. See - I'm a dork!