Based in San Francisco and backed by many investment rounds from trusted investors, Coinbase is the largest online platform in the U.S. where it is both a Bitcoiin wallet and also a simple exchange for buyers to buy Bitcoin. Coinbase is popular, trust-worthy, and available for Bitcoin users 18+ years of age in the U.S.
This is a companion discussion topic for the original entry at http://www.bitcoin-en.com/buy-bitcoin-on-coinbase.html