If you are using google chrome and if you set "continue where I left off", chrome will restore your browsing data and session cookies.
even Facebook login (without "remember me") session is retained.
See : https://support.google.com/chrome/answer/95314?hl=en&p=settings_reopen_pages&rd=1
You can use
to remove all sessions from an application on Applicatio_End() method in global.asax
Hope this will help you.
DNS Gold Member
"Failure is the path of least persistence"