#4 Tumblr:

Headquartered in Midtown Manhattan, New York City, Tumblr is a microblogging platform and social networking website that allows users to post multimedia and other content to a short-form blog. Users can follow other users' blogs, as well as make their blogs private. Much of the website's features are accessed from the "dashboard" interface, where the option to post content and posts of followed blogs appear.

As per reports dated April 13, 2013, Tumblr currently has over 102 million blogs throughout the internet.

#3 UberMedia:

UberMedia is considered as one of the fastest growing companies, with a lot of innovation. The company recently was featured in the Top 50 startups by Wall street Journal. Users who need a boost to their mobile ad or application campaign can consider UberMedia to be the best choice.

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