Twitter is an American online news and social networking service on which users post and interact with messages known as "tweets". Tweets were originally restricted to 140 characters, but on November 7, 2017, this limit was doubled for all languages except Chinese, Japanese, and Korean.
Instagram is a photo and video-sharing social networking service owned by Facebook, Inc. It was created by Kevin Systrom and Mike Krieger, and launched in October 2010 exclusively on iOS.
Pinterest, Inc. is a social media web and mobile application company that operates a software system designed to discover information on the World Wide Web, mainly using images and, on a smaller scale, GIFs and videos. The site was founded by Ben Silbermann, Paul Sciarra, and Evan Sharp