I don't think Google has anything to fear from Facebook - lets face it, facebook is a one-trick-pony, and frankly one I (personally) can and do live without.
Search, on the other hand, I cannot. Search is the gateway to almost all facets of the web, not just some time-draining social site. Facebook is not the internet, just a big residential therein.
Likewise, not having a computing device tends to be a restriction on getting to either Google or facebook, so I don't think Apple has anything to fear either, apart from other kit shifters.
So in other words...the two CEO's of not-so-similar and non-dependant companies moved on, and everything ran as normal, and the world didn't end. Move along...