Instagram, the four-year-old mobile first photo and video sharing platform, just hit a milestone for its community. Twitter currently has 284 million Monthly Active Users while Instagram reported that it has over 300 million. Although Instagram's community is still smaller than its parent company, Facebook, and its video competitor, YouTube, it's growing the fastest in 2014. Facebook has 1.35 billion Monthly Active Users and YouTube is at 1 billion. To put it into perspective, Facebook is ten years old, Twitter is nine, and Twitter is eight. Click here to learn more about the achievement of this milestone.