Some intriguing perspectives
As web traffic soars, driven increasingly by mobile, Facebook is gaining disproportionately to its peers, including Google. Facebook is the first website to top one trillion page views per month, leading some to speculate that Facebook could be the first company valued at over $1tb.
That number may be high, but Facebook's current valuation of roughly $75bn is almost certainly too low. Google is currently valued at roughly $175bn, essentially for its search/ad business. Facebook's own ad revenue doesn't yet approach Google's, but its potential is arguably bigger.
"Social", not algorithms, is the basis for all human commerce. Facebook owns social. That's got to be really, really big. At least as big as Google, and arguably bigger.