I have accounts in close to 10 Stack Exchange powered sites. I want to change my nickname in all the sites. Is there a way I can do it from one page that would reflect in all of the Stack Overflow/Stack Exchange sites ?
You can edit your profile on one account, go to the
accounts tab of your profile, then scroll to the bottom of the page. You'll see three buttons – you can click the first one (
Copy X profile to all Stack Exchange accounts) to then push the changes to all your accounts.
This changed recently. There's a tab at the top of your profile:
This links to https://stackoverflow.com/users/edit/current.
To save to all the sites, click the "Save and copy changes to all Stack Exchange communities" button at the bottom: