2012 billion-dollar Facebook acquisition

• App on which Justin Bieber's account is the most popular
• Popular image manager
• App popular with animals?
• Facebook purchase of 2012
• Popular male to sign 21s here
• "Fast beautiful photo sharing" company
• Photo-sharing app
• Photo-sharing social media site
• "Capture and Share the World's Moments" company

Wikipedia Word definitions in Wikipedia
Instagram is an online mobile photo-sharing , video-sharing , and social networking service that enables its users to take pictures and videos, and share them either publicly or privately on the app, as well as through a variety of other social networking ...