Social media is the collective of online communications channels dedicated to community-based input, interaction, content-sharing and collaboration. Websites and applications dedicated to forums, microblogging, social networking, social bookmarking, social curation, and wikis are among the different types of social media.

Facebook:

It’s a popular free social networking website that allows registered users to create profiles, upload photos and video, send messages and keep in touch with friends, family and colleagues. According to statistics from the Nielsen Group, Internet users within the United States spend more time on Facebook than any other website.

Twitter:

It’s a free microblogging service that allows registered members to broadcast short posts called tweets. Twitter members can broadcast tweets and follow other users' tweets by using multiple platforms and devices.

Linkedln:

It’s  a social networking site designed specifically for the business community. The goal of the site is to allow registered members to establish and document networks of people they know and trust professionally.

Reddit:

It’s a social news website and forum where stories are socially curated and promoted by site members. The site is composed of hundreds of sub-communities, known as "subreddits." Each subreddit has a specific topic such as technology, politics or music. Reddit site members, also known as, "redditors," submit content which is then voted upon by other members. The goal is to send well-regarded stories to the top of the site's main thread page.

You Tube:

It's a video sharing website where users can upload, view and share video clips. Increasingly gaining currency in the business world - YouTube is becoming a great platform for delivering video based testimonials, how to guides and commercials promoting products/services.

Yahoo:

Answers is a website that allows users to both submit questions to be answered and answer questions asked by other users.

Social media is becoming an integral part of life online as social websites and applications proliferate. Most traditional online media include social components, such as comment fields for users. The term "social media" is likely to lose meaning as the social aspect of the Web becomes increasingly taken for granted.