Friend or stranger??

This is embarassing.

Have you been in a situation where you do not remember the name of a friend even though you try really, really hard to? I met some people during my friend's convocation today and to be honest, I really can't figure out their names.

So, what I did, you wonder??

Haha.. I just ignored her and looked somewhere else. That is so much safer.

Does it mean that she is not a friend? So, what is a friend? I can't seem to be able to categorize her as a friend when I can't even remember her name.

I am surrounded by a few friends who mean the whole world to me. I think that's it.

The question is : What makes a friend a friend?
 
Can it be measured by a time frame? If yes, is there some sort of probation period for a friendship? Do we seive our friends? Are friends a choice or a part of so-called "fate"? What else are the parameters? E.g. less than 10 sms/month=acquaintance, more than 30sms/month=friend?? Absurd!!!!

Hope I find an answer to this and in the mean time, I will try hard to recall her name... Btw, it's WC's friend and I don't think she is called Jennifer... Sorry.