American joke, PLS help me.?

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This is a joke I found on the net.

And you will see at the bottommost "P.S. Stanford is great...I love it, though I miss you both terribly...and Socks, too!".

PLS tell me what does "Socks"mean.

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Dear Mom and Dad:

It has been four months since I left for college. I have been remiss in writing and am very

sorry for my thoughtlessness. I will bring you up to date now, but before you read on,

please sit down. Don't read any further unless you are sitting down ... OK?

Good. I am getting along pretty well now. The skull fracture and the concussion I got

from jumping out of the window of my dormitory when it caught fire, shortly after my

arrival, are pretty well healed now. I only spent two weeks in the hospital and now I can

see almost normally and only get three headaches a day.

Fortunately, the fire in the dormitory and my jump were witnessed by an attendant at a

nearby gas station, and he was able to call the Fire Department and the ambulance. He

also visited me at the hospital, and since I had nowhere to live because of the burnt-out

dorm, he was kind enough to invite me to share his apartment with him. It's really a

basement room, but it is kind of cute. He is a very fine boy and we have fallen deeply in

love and are planning to get married. We haven't set the exact date yet, but I'm sure it

will be before I start to show.

Yes, Mom and Dad, I am pregnant. I know how much you are looking forward to being

grandparents, and I know you will give the baby the same love and devotion and tender

care you gave me when I was a child.

The reason for the delay in our marriage is that my boyfriend has some minor infection

which prevents us from passing our premarital blood tests, and I carelessly caught it

from him. This will soon clear up, thanks to my daily penicillin injections. I know you will

welcome him into our family with open arms. He is kind, and although not well educated,

he is ambitious. Also, he is of a different race and religion than ours, but I know, after all

your years of teaching me tolerance, that you won't mind the fact that he is somewhat

darker than we are.

I am sure you will love him as I do. His family background is good, too; I am told that his

father is an important gunbearer in his native African village.

I guess that's it. Now that I have brought you up to date, I want you to know ... There

was no dormitory fire, I did not have a concussion or skull fracture, I was not in the

hospital, I am not pregnant, I am not engaged, I do not have syphilis and there is no man

of another race in my life. However, I am getting a "D" in History and an "F" in Science,

and I wanted you to see these marks in their proper perspective.

Your loving daughter,

Chelsea

P.S. Stanford is great...I love it, though I miss you both terribly...and Socks, too!

P.P.S Dad, please give my best to Monica & the others.

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