An anonymous reader shares a report from Bloomberg, explaining how Silicon Valley makes billions of dollars peddling personal information, supported by an ecosystem of bit players. Editor Drake Bennett highlights the battle between an upstart called HiQ and LinkedIn, who are fighting for your lucrative professional identity. Here's an excerpt from the report: A small number of the world's most valuable companies collect, control, parse, and sell billions of dollars' worth of personal information voluntarily surrendered by their users. Google, Facebook, Amazon, and Microsoft -- which bought LinkedIn for $26.2 billion in 2016 -- have in turn spawned dependent economies consisting of advertising and marketing companies, designers, consultants, and app developers. Some operate on the tech giants' platforms; some customize special digital tools; some help people attract more friends and likes and followers. Some, including HiQ, feed off the torrents of information that social networks produce, using software bots to scrape data from profiles. The services of the smaller companies can augment the offerings of the bigger ones, but the power dynamic is deeply asymmetrical, reminiscent of pilot fish picking food from between the teeth of sharks. The terms of that relationship are set by technology, economics, and the vagaries of consumer choice, but also by the law. LinkedIn's May 23 letter to HiQ wasn't the first time the company had taken legal action to prevent the perceived hijacking of its data, and Facebook and Craigslist, among others, have brought similar actions. But even more than its predecessors, this case, because of who's involved and how it's unfolded, has spoken to the thorniest issues surrounding speech and competition on the internet.