That's an interesting way to put it. Facebook seemed destined to overtake MySpace as it provided useful data connections (college courses/networks) and a uniform design that MySpace did not have. Lyft has pretty much been trying to be a drop-in replacement for Uber (to be fair, Uber nicked a few ideas from Lyft), with no projects like automation or even Uber's attempts at being a delivery service. If Lyft ends up winning, it's going to be a much more unexpected win than Facebook over MySpace.

Edit: the innovation of the News Feed can't be overstated. IIRC, MySpace had nothing like it and it's hard to remember Facebook before it.