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2.
You suffer from this disorder when you don't remember a person, who is trying to add you as a friend on Facebook, and they remember you from a past school or job.

Typically speaking, you two are bound to have at least a few mutual friends as the only evidence on Facebook that you know each other.

The only known cure for Facebook Alzheimer's is to look up the person in a past school yearbook as a way to jog the memory that is encapsulated somewhere in the hippocampus. It best to do an yearbook lookup reference ASAP, before the forgetfulness gets any worse.
Monica: Hey Ross, I don't remember Charlie from high school at all.
Ross: Hey Mon, he's like the only guy who noticed you when you were fat.
Monica: Well, now I'm hot, all guys notice me.
Ross: Well, I would have to say that you are suffering from a disorder syndrome known none other than Facebook Alzheimer's.
Monica: O no, I got to get my yearbooks out of my closet and try to jog my memory, as soon as possible.
by FriendsFan2007 June 08, 2009
 
1.
If you remember somebody from earlier in your life and your supposed friend does not remember who you are or how you know them, then that person has facebook alzheimer's.

Basically, it is somebody who does not remember you, but you remember them and you want to be facebook buddies.
Joey: Hey Chandler, Gloria doesn't remember me from high school. She wouldn't agree to add me as a friend on facebook.
Chandler: Well, how do you remember her?
Joey: I like slept with her three times.
Chandler: She probably has Facebook Alzheimer's.
Joey: How come girls suffer from Facebook Alzheimer's more often than guys.
Chandler: It's because of lower brain capacity in females; well, you see, when girls go off to college, they have to make a choice - either remember past sex partners like you, or gain further knowledge in their college major.
Joey: Very intriguing.
by FriendsFan2008 June 02, 2009
 
3.
When you get a friend's request from someone that you have no idea where you know them from. The worst part is you have mutual friends from work and school! You post messages on each other's wall and they never know you have no clue as to how you know them.
Tom: who the heck is this requesting me as a friend?
Tom: I have no clue who this is.
Tom: Crap, I have a case of Facebook Alzheimer's
by J Rumundo May 27, 2009