After posting it I realised there are a bunch more I've left off.

Like all the companies owned by Facebook

http://www.pocket-lint.com/news/128617-what-does-facebook-own-here-s-the-companies-it-has-acquired-and-the-reasons-why

I'm planning to set up a webpage for the list so I can update it after this page is over the seven days edit limit.

There are many more - like Instagram...