This question already has an answer here:
Cannot find a logout-link/button.
Yes, asked before - answered before. Lots of time. Know that. Unfortunetaly no one of the answers do the job.
If I log off Google, I'm still logged in to stackoverflow. If I'm logged off stackoverflow I'm still seing my credentials, as I see them - not how "foreign" people should see them.
Reason? I want to see my profile as other see it.
Suggestion: There should be a "how people see you"-feature.