It reminds me of when we first entered the industry. OOF! I can still smell the canvas! ;-)
Since then we've learnt a lot. There will be no Google-killing search engine anytime soon and social search is not simply Facebook + search. I believe social search is about creating a shared global search memory similar to Vannevar Bush's 1945 vision of the Memex.
"There is a new profession of trail blazers, those who find delight in the task of establishing useful trails through the enormous mass of the common record."Search trails are the missing ingredient - a simple, transparent, democratic system of way finding - no PageRank, OpenRank, MinesMoreOpenThanYoursRank - required.
Wikia, Mahalo and Google will litter the search landscape with Knols and other 'editor' controlled silos of information - but we will still need trails between them. The trails themselves need to be honest search memories, made by the masses, not by a group of self-appointed 'editors'.