I am new to Stack Exchange and I hope you can help with my account registration.
I would like to know why I am given random user names like user186934 when I log in with my Google account?
Is this the name I will be known by here at Meta Stack Overflow?
Is there a way for me to change this name to something else?
Will I be able to use this same name on other Stack Exchange websites?
And one last thing, if I would like to register for a regular Stack Exchange account without using Google or Facebook, etc, will I be able to re-use the same e-mail address?