Instagram is an online photo-sharing and social media networking service that enables its users to take pictures and videos, and share them on a variety of social networking services, such as Facebook and Twitter.
By December 2010, Instagram had 1 million registered users. In June 2011 Instagram announced it had 5 million users and it passed 10 million in September of the same year. In April 2012, it was announced that over 30 million accounts were set up on Instagram. Instagram is growing the fastest of all social media sites worldwide, increasing its active user base by 23% in the last six months. But on an overall basis, it’s still behind the likes of Facebook, YouTube, Google+, Twitter and LinkedIn — which come respectively in at positions 1-5 of the world’s most popular social platforms in terms of penetration.