They are building services that take your information and try to do something interesting enough with it to make it worthwhile...and why is it on by default? Because they want to make money off of the new features and deep integration with your information.
This isn't news. But it certainly may be another excuse to have the exact same conversation that nothing will come from.
Never mind that data generated and collected from cell phone usage will always make the privacy impinging features of your laptop look tame in comparison.
Never mind that the only way to stop companies from doing this is through the political processes that everyone seems to have written off.
EDIT: Downvoting because someone disagrees with the principal argument of the post is lame. Cheers.