Here is good news for Facebook lovers. If you are a Mozilla Firefox user and spend most of your time on Facebook then the latest Firefox version is coming with a new feature called "Social API" which is helpful in accessing social networks like Facebook, Twitter, etc. As per this new feature, you can add social network buttons and sidebars in Firefox window so as to chat with your friends, checking messages, notifications, etc. get quick and easy.
Selenium Grid uses Selenium Server to execute either Selenium RC or Selenium WebDriver tests in parallel on different machines. It is required to configure a hub and node to execute the test cases in remote machines connected over LAN networks. In this hub acts as a mediator or like a server which configures multiple nodes to a hub.