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 platforms, such as Facebook, Twitter, Tumblr, and Flicker.
Where does the name come from?
When we were kids we loved playing around with cameras. We loved how different types of old cameras marketed themselves as "instant" - something we take for granted today. We also felt that the snapshots people were taking were kind of like telegrams in that they got sent over the wire to others - so we figured why not combine the two?
What is a hashtag?
Hashtags are a way of categorizing content and tracking topics on Twitter and other social media platforms like Instagram and Pinterest. When you use hashtags, you help people who are interested in your topic find your posts and Tweets. You can use a hashtag at the beginning, middle, or end of your post.