I've associated my SO and Meta accounts - network profile
However got the association bonus only on Meta, but not on SO. Why is that?
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Check https://stackoverflow.com/reputation; on the bottom of the page you should see the following line:
** rep from bonuses: 100
It is right before the line showing the total reputation, and after the lines showing the reputation gained this week, this month, this quarter, and this year.
If then you look at your reputation page, you will find a voice saying:
+100 assoc Association Bonus
In your case, that is found for July 4, 2012.
You should gain it when you have at least two associated accounts, and in one of those accounts the reputation is at least 200.