Instagram is an online photo-sharing, video-sharing and social networking service that enables
its users to take pictures and videos, apply digital filters to them, and share them
on a variety of social networking services, such as Facebook and Twitter.
A distinctive feature is that it confines photos to a square shape, similar to Kodak
Instamatic and Polaroid images, in contrast to the 16:9 aspect ratio now typically
used by mobile device cameras.
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