"THERE IS NO OVERSIGHT!"
Should there be? I'm not quite sure. I mean, personally I feel a lot safer managing my own data privacy with what I give these companies, rather than having a government do it for me. And I'm not exactly a libertarian, I just think it's rational that this should be decentralized, the risk of a company turning against "us" is a lot less than a government, given history.
"I've switched away from Facebook, and now I've lost touch with a lot of friends. They are my friends, why can't I export them? Why can't I export the data that belongs to me, and use it in some open-source format that allows me to reap the benefits of all the work that I spent tracking them down inside of Facebook's private garden?"
You can.
https://developers.facebook.com/docs/graph-api/reference
All those "What does your friend list say about your love life?" type surveys use it.
"As a society, we need to start addressing these things, or we are going to end up with Internet giants that we don't have the means to get rid of, and that aren't at risk of being out-competed."
We've heard this a lot over the years, but I've really never seen a case of a company that can't be out-competed. Who is it up to to "get rid" of an organization? On what basis? People stop using their services, and they stop making money is generally how it works. Otherwise, Antitrust law is the main mechanism today, isn't that sufficient?
People forget that Google didn't ask permission or get oversight or contact copyright holders when building a search engine. They hooked a couple servers on the web and started crawling it with their algorithm, and replaced other search engines pretty quickly because they had a better service. One could say that it's impossible to compete with Google, but I'm not so sure: Bing is doing fine (if small share), DuckDuckGo is growing, etc. Adding more oversight/regs to the Web just makes it harder to replace these companies.
I'm sure plenty wanted to "get rid" of Microsoft in the 90s because of their attitude and growing monopoly, and certainly they were fettered by the U.S DOJ., but looking back, the calls to break them up were a bit silly. No one would have predicted Apple was going to become much, much bigger (some still can't believe it).