Is meta data copyrighted? Could minimum royalty laws exist?

Google advertises on pages of aggregated link titles and website descriptions. Google automates the collection of website page titles and site descriptions. Human people manually create this content through effort and intellectual labor. Is Google effectively earning money from copyrighted content?

Facebook earns money from massive amounts of content created by more than two billion people. Should Facebook be compelled to distribute 70% of net profit earned from advertising back to content creators/contributors?

Amazon willingly/voluntarily distributes to creators about 70% of profits from electronic books they sell on Amazon.