How Does Facebook Know I Know These People?
Monday, December 7th, 2009
I just learned something interesting about Facebook.
I got an invitation to join from a friend of mine I knew from Boston. He now lives on the west coast.
At the bottom of the email it had a section of ‘Other people you may know on Facebook.’
And it listed two people I know from my church, one person who is another dog walker I see at the park, a friend of the family who is recently graduated from college, a woman who was on the volleyball team with me at my college a million years ago, and one of my dog walking clients.
So I started poking around online because it’s astounding how FB figured out that I know these people.
All the people have two things in common:
Here’s a related thread:
Facebook Friend Suggestion: How Does it Know???
I got an invitation to join from a friend of mine I knew from Boston. He now lives on the west coast.
At the bottom of the email it had a section of ‘Other people you may know on Facebook.’
And it listed two people I know from my church, one person who is another dog walker I see at the park, a friend of the family who is recently graduated from college, a woman who was on the volleyball team with me at my college a million years ago, and one of my dog walking clients.
So I started poking around online because it’s astounding how FB figured out that I know these people.
All the people have two things in common:
- They have all sent me an email at the same address my friend sent the invite to AND
- They all have web-based emails (hotmail, gmail, aol, etc.)
- When my friend sent me the invite, he made my email address known to Facebook.
- Since those people have web-based email accounts, their address books are also web-based.
- Somehow Facebook was able to access their address books and match my email address on it.
Here’s a related thread:
Facebook Friend Suggestion: How Does it Know???