I am an introvert 20 year old college student; each college semester
people ask me, if i have any type of social network such as myspace or
facebook ect. However, i feel that i don't need any of those social
networks because we have emails or messengers. In some instances,
people have gotten frustrated and disappointed at me. Although i am an
introvert, i understand i have friends but i don't want them near my
personal life. I also understand that there are different types of
extroverts and introverts. But, until what degree are people going to
expose themselves?

So how important are social networks?
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Composite Doors
Composite Front Doors

How much you let people know about yopu depends in you and only you.

I have been dragged to most of the social networks I joined. Included Facebook, however, only after I've tried them I can tell which ones I actually like the way they work and I have the people I want to be in contact active enough for me to stay.

I liked tagged a lot, but my friends didn't, so I ended up deleting my account, I also deleted many of other portals I joined because of the invites that wouldn't cease to fill my inbox.

I don't think you must be obligated to have facebook or myspace or twitter just for being on the netz, and I don't think you are losing much, specially if you are the kind of person that keeps in ontact through writing messages in emails and using IM.