ColourOfSpring - 4:34 pm on May 12, 2013 (gmt 0)
I feel Facebook is a much larger threat than Google. Not only because it only searches internally, but also due to the fact that it is a lot more aggressive in ensuring its dominance and stickiness is maintained!
Who REALLY looks to buy stuff on Facebook or look for a service there? It's a "downtime" destination - a place to do nothing rather than do something.
IMHO, I don't really see much serious competition to Google - in fact, I wouldn't be surprised if the big players aren't all in cahoots in someway (eBay, Amazon, Google) to maintain the current hegemony.