Er,that would be a stockbroker.
Where? Through any major stock broker.
There are many comparison charts for online brokers, plus look in Barron's or other papers:
http://www.brokerswiki.com/
http://www.brokerage-review.com/
http://online-stock-trading-review.topte...
http://www.howthemarketworks.com./
Stocks Basics: Introduction
http://www.investopedia.com/university/s...
Getting Started In Stocks
http://www.investopedia.com/articles/bas...
Read a good book or three, like Investing For Dummies, and the Millionaire Next Door, available at your local library for free.
http://www.investopedia.com/university/b...
Look up stockbroker companies. Ever seen that E-Trade baby commercial? Yeah, those kinda websites.
P.S. Don't buy FB please.
etrade, Scottrade, or similar
Where can you buy and own stocks like facebook, ebay or some other company?