“Founded in 2004, Facebook’s mission is to give people the power to share and make the world more open and connected. People use Facebook to stay connected with friends and family, to discover what’s going on in the world, and to share and express what matters to them.” Facebook is an online social networking platform, with features that include: user profiles; ‘friending”; news feeds with updates about friends and events; timeline (your collection of photos, stories, and experiences that tell your story); groups; messaging; chat; video calling; and sharing of likes, interests, and events.

LinkedIn is “the world's largest professional network with 225 million members in over 200 countries and territories around the globe.” The website can help you: “establish your professional profile; build and maintain a broader network of professionals you can trust; find and reconnect with colleagues and classmates; learn about other companies; leverage powerful tools to find and reach the people you need; tap into the knowledge of your network; and discover new opportunities."

“Yammer brings the power of social networking to your company. Yammer is as easy to use as great consumer software like Facebook and Twitter, but is designed for company collaboration, file sharing, knowledge exchange, and team efficiency.” With Yammer you can: “create, discuss, and share content with coworkers without sending a single email; store large files, post documents to team workspaces, and collaboratively edit pages in real time; find the content, conversations, people and business data you need, when you need them; search instantly across your entire company and all your other business applications; and connect and collaborate with external customers, vendors and business partners.”