Facebook.Com Search Friends
For those who have no idea about the reverse email lookup-- I'll wager there will be couple of- It's an email-based search functionality that lets users to browse for other Facebook user based upon their e-mail address.
Utilizing this function is dead simple. Just paste the e-mail address of the a stranger or unknown e-mail sender into the Facebook search box and an auto-suggest drop down will let you know if a matching profile exists in the social media network.
Upside.
A major benefit of this feature is that it offers an approach for validating unidentified e-mail addresses and help you to find an individual in seconds.
Downside.
A major oversight of this feature is that spammers can easily map gathered e-mail accounts to user profiles, and utilize the publicly available details to craft very convincing customized emails (for phishing). Facebook.Com Search Friends So, if you are on Facebook, avoid sharing your email address with complete strangers on forums and chat rooms.