(Tuesday, 30.Aug.2011, Taiyuan China time) Until a day or so ago, my reputation ranking was 774. Then, suddenly, with no activity on my part, it is 874, exactly 100 points higher. What happened?

One way this can happen is by your logging into a second StackExchange site for the first time. Do you think it might be that? – Dylan Moreland Aug 30 '11 at 1:55
A check of your account tab: math.stackexchange.com/users/2344/mike-jones?tab=accounts says this is your only account with rep $\geq 200$; you might want to visit math.stackexchange.com/reputation to see how your rep went up. – J. M. Aug 30 '11 at 2:03
@Dylan Moreland: Yes, I signed up with Meta Stack Overflow. So, is such bumping up of rep in another site a bug, or not? Thanks. – Mike Jones Aug 30 '11 at 3:00
@Mike I think this is by design. See this answer on the SO meta. It happened to me when I signed up for the TeX SE. – Dylan Moreland Aug 30 '11 at 3:27
up vote 7 down vote accepted

This is by design. See this blog post where the feature is announced, and the official answer on meta.SO (in the "additionally" section). As both resources mention, only one of the two accounts you are associating needs to have $\geq200$ reputation.

Also, if you go to http://math.stackexchange.com/reputation to audit your reputation, I am pretty sure the association bonus appears in the line

 rep from bonuses: 

although I am not sure what other bonuses exist... perhaps any bounties you've earned are included in this row as well.

By the way, I performed a recalc on your account (you can do this too using the "Trigger Reputation Recalc" button at the bottom of http://math.stackexchange.com/reputation) and that bumped it to 885. I'm afraid there's no good way of figuring out where the net difference of 11 points came from; generally, your "displayed" reputation can fall out of line with your "real" reputation, and the reputation recalc is just a manual update of the "displayed" reputation.

Thanks for the info. I've upvoted and accepted your excellent answer. – Mike Jones Aug 30 '11 at 7:52
I'm glad to help! – Zev Chonoles Sep 1 '11 at 2:42

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