Bitit is an encrypted site. LocalBitcoins operate globally, but it depends on the liquidity of traders in your country. Any other limits will be set with consent of buyer and the seller. Similar to LocalBitcoins, your Bitcoins are held in the escrow which will be received once the payment is confirmed. This exchange is similar to LocalBitcoins, where you can meet the seller and trade in person while the site acts as an escrow.