Anti-bot CAPTCHA widget that helps digitize books by providing snippets of books for people to enter the text for. Owned by Google.
CloudFlare is a global CDN and DNS provider that can speed up and protect any site online.
websites using the $ symbol on their website - meaning it may accept payment in this currency used in Israel.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook