http://punctuative.disqus.com/enMon, 05 Feb 2007 23:25:09 -0000http://punctuative.com/2007/01/08/e-commerce-20/#comment-3145804<a href="http://www.comparisonengines.com/2007/01/04/the-buysafe-revolution-2007/" rel="nofollow">http://www.comparisonengines.com/2007/01/04/the...</a>ventureblogalistMon, 05 Feb 2007 23:25:09 -0000http://punctuative.com/2007/01/08/e-commerce-20/#comment-3145803I agree with all of these because I think ad spend is becoming less efficient as there is more competition in the keyword longtail and also in more generic terms as more companies use adwords and the large public companies pump big dollars into online ads. Plus, attention is harder to win over. Personalization / RSS etc. is making for higher switching costs , leading to less browsing.ventureblogalistSun, 04 Feb 2007 15:18:07 -0000