There are a number of developers for whom we were unable to determine a corporate affiliation; those are grouped under “unknown” in the table below. With few exceptions, all of the people in this category have contributed ten or fewer changes to the kernel over the past three years, yet the large number of these developers causes their total contribution to be quite high.
The category “none,” instead, represents developers who are known to be doing this work on their own, with no financial contribution happening from any company.
"Unknown" means they don't know if the author's work is sponsored.
We dodged that bullet but now we're heading to a world where facebook.com plus a small few other sites are the internet.
If that were true, there would be no point in search. Yes there are a few that are very popular, but their relative popularity doesn't come at the expense of the very long tail.