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For those who have no idea about the reverse e-mail lookup-- I'll bet there will be few- It's an email-based search performance that lets users to look for other Facebook user based upon their email address.
Utilizing this feature is dead simple. Just paste the e-mail address of the a complete stranger or unidentified 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.
Upside.
A major advantage of this function is that it supplies a technique for verifying unknown e-mail addresses and help you to discover an individual in seconds.
Disadvantage.
A major mistake of this feature is that spammers can easily map gathered e-mail accounts to user profiles, and utilize the openly offered information to craft very convincing individualized emails (for phishing). Facebook Login Facebook Login Friends Search So, if you are on Facebook, avoid sharing your e-mail address with strangers on online forums and chatroom.