Facebook Login Search Friends
For those who don't understand about the reverse email lookup-- I'll bet there will be few- It's an email-based search performance that lets users to browse for other Facebook user based upon their e-mail address.
Using this feature is dead simple. Simply paste the e-mail address of the a complete stranger or unidentified email sender into the Facebook search box and an auto-suggest fall will let you know if a matching profile exists in the social network.
Upside.
A major benefit of this feature is that it offers a method for validating unidentified email addresses and help you to discover an individual in seconds.
Disadvantage.
A major oversight of this feature is that spammers can quickly map harvested email accounts to user profiles, and use the publicly offered info to craft really persuading personalized e-mails (for phishing). Facebook Login Search Friends So, if you are on Facebook, avoid sharing your e-mail address with strangers on online forums and chat spaces.