This is a total guess, but the author does seem to hint a preference for LinkedIn:

> I was very impressed throughout the entire interview process with LinkedIn from both a culture perspective and an engineering perspective. They rose the highest on my mental list of iOS Prestige™ from the start of the process until the end.

I'm interested on the differences between all the offers. It still surprises me how much variability there is between the top companies.

It’s much easier to compare multiple offers made to the same person, rather than comparing isolated offers on websites like Glassdoor.