Steps:-
1) Invite friend to chat.
2) Make sure all the tabs, browsers and other internet things are closed. If possible then clear browser cookies and history.
3) While chatting on Facebook open start using Windows key + R and type cmd.
4) Then write netstat -an in cmd and press enter.
5) Now you can see IP address of all established connection.
6) Note all the suspicious IPs' and trace using sites like whatismyip.com , ipmango.com , traceipaddress.co.in.
And get the Locaton and Username of IP address.
