Google - It was inevitable, they've had their thumbs in so many pies, I'm surprised they didn't branch into phones sooner.
Facebook - Most websites have/had a search function that works/worked within the site. This was more common in the early days, before they could just get a Google widget to do it for them.
Amazon - Why WOULDN'T they sell more things? Doesn't really feel like they're copying anyone, just making good business decisions.
Apple - I hate the company, but EVERYONE has their own little social network. Not sure what the music cloud is, but whatever, whoever made this is a piece of shit.
Twitter - Oh, ok, you're right, Google invented internet advertising. Anyone who ever puts an ad anywhere on their page copied Google.
Microsoft - Yeah, sure Microsoft, just keep telling yourself that. Don't forget that you've made some of the shittiest programs and websites that ever existed. Tell me more about how everyone uses Bing, and how well Live works and is not frustrating to use at all?