Most of us already know that Facebook is the top social network on the web. It's a thriving beast of a social networking site on the web with about 2 billion monthly active users and more than one billion that log on daily (according to Facebook itself).
LinkedIn is an online social network for business professionals. It's different than other social networking sites like MySpace and Facebook because it's designed specifically for professional networking -- finding a job, discovering sales leads, connecting with potential business partners -- rather than simply making friends or sharing media like photos, videos and music.
In some ways, Tumblr is actually Facebook 2.0! As Facebook has become a real-life social network infested with parents, co-workers, ex-friends, and people you barely know, Tumblr has become the place where young people express themselves and their ACTUAL INTERESTS with their ACTUAL FRIENDS.
Instagram is a social networking app made for sharing photos and videos from a smartphone. Similar to Facebook or Twitter, everyone who creates an Instagram account has a profile and a news feed. When you post a photo or video on Instagram, it will be displayed on your profile.
Social media is any site that provides a network of people with a place to make connections. And, as we are talking about YouTube as a social media site, what better way to show you how social media works than this popular YouTube video describing social media in easy-to-understand terms.