While not as tiny, Craigslist has a huge user base all over the world and still has less than 50 employees total (not just devs). IMO it's the poster child of being able to scale worldwide while keeping the product highly focused, highly operational, and avoiding feature and technical fluff.
While it's true that most countries have their homegrown version by now, I've used Craigslist myself in other countries, and it does have enough of a presence that it's actually maintained in over 50 countries which is no small feat.
Another interesting point is that Craigslist has $10-20M revenue / employee (depending on the numbers you read), compared with Apple at $2M/employee (maybe nVidia has more these days, but not consistently)
And it has a founder who gives away most of his money instead of joining the monetize-everything-billionaire-$$hole club
(No affiliation with Craigslist; just like Craig's story, much like I do Nadia's).
