I had or have at least two accounts, one originally with mathematica.stackexchange.com for which my login was via Facebook (or possibly Google), which in turn used, let's call it, email-address-1. Subsequently I went also to tex.stackexchnage.com, got a "Join this community" link when I tried to post, and so created a login using, let's call it, email-address-2.
I just allegedly merged the two accounts. Nonetheless, my profile info still shows two different accounts, one for each of the two email-address -- actually, it shows THREE possible logins now, one via Facebook using email-address-1, another via Google using email-address-1, and the third direct, using email-address-2.
How do I straighten this all out?
As indicated, I already had completed the "merge two accounts" process. supposedly.
And I'm still confused: is a login for stackexchnage as a whole, or just for an individual stack exchange community.