The document discusses three popular social media platforms - Facebook, Snapchat, and Instagram. Facebook was founded by Mark Zuckerberg and allows users to post photos, statuses, and share photos with others. Snapchat allows users to send photos and videos to friends and families as well as quick messaging, and was founded by Evan Spiegal and Bobby Murphy. Instagram was created in 2010 by Kevin Systrom and Mike Krieger and is used most by younger generations for more advanced sharing than Facebook.