The sites that I compared were Facebook, Twitter, Instagram, and Tumblr. All each of these sites you have some kind of news feed or dashboard where you view the things the people you are following or are friends with are posting. You can share pictures and videos on all of these sites. There are direct messages on all sites. Twitter has a limit on how much you can write. Facebook and Twitter are pretty similar because you can write statuses on both. Instagram and Tumblr are more for sharing pictures and videos. You can have discussions on Facebook, Twitter and Tumblr can’t have a discussions on Instagram.