Twitter advertising includes conversion tracking and re-marketing tools.
Identifies administrators for a page which will be able publish data to your wall if you like any content within this page.
The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.
Open graph description entity tag
Sites who has this tag are verfied by google to use WebMaster tools