Tumblr may be new territory to many Internet users, but the platform actually launched in February 2007 by then-20-year-old founder David Karp. According to Tumblr, the network has since grown to host over 200 million blogs. Yahoo purchased the site in June 2013.

So what exactly is Tumblr? It is both a social network and a multimedia microblogging platform, and this combination sets the platform apart from other social networks. Tumblr is much more than a place to share status updates and post photos of your pets — yes, you can share those things, but you also have a ton of options at your disposal. Unlike on Twitter, you're not limited to 140 characters, so you can write long blog posts to your heart's content. And unlike on Instagram, where you can only share one photo or video at a time, on Tumblr, you can share photosets and videos longer than 15 seconds. In fact, there are few limits to what you can share on the platform.

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