Today I received an email from facebook regarding my security being changed (something I did not do and when i checked my facebook security had been compromised).  As i was reading this email, it disappeared.  I checked in all folders and it is not there.  It was as if someone was logged in alongside me and had deleted it.   I have since changed my password and security details on my hotmail account where the email was received to.   DOes this sound possible and is changing my password enough?