But Zynga and Facebook? They seem more able to be toppled. It seems possible to knock them off of their throne. Two companies, OMGPOP and Instagram, came out of nowhere and became viable competitors. That’s kind of amazing. It’s amazing to me that Instagram got 30 million users in no time at all. It’s crazy that Draw Something can get 50 million downloads in 50 days. It’s mind blowing that Pinterest went from nothing to 10 million users in the blink of an eye. It’s amazing how fragile it all is. Facebook may be the first viable threat to Google, but its own market dominance is by no means assured.