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Email used by government
Email was being used by the military by 1974. http://nethistory.info/History%20of%20the%20Internet/email.html -
Google
Larry Page and Sergey Binn created it while they were at Stanford https://www.google.com/about/company/history/ -
Youtube
Created by Chad Hurley, Steve Chen, and Jawed Karim, who all met through PayPal.
Was initially funded by bonuses recieved following the eBay buy-out of PayPal.
(http://mashable.com/2011/02/19/youtube-facts/ ) -
Instagram
Kevin Synstrom was the founder and later sold it for 400 million dollars. http://www.celebritynetworth.com/articles/celebrity/27-year-instagram-ceo-400-million/