incrediBILL - 6:41 pm on Jan 13, 2011 (gmt 0)
there's no other explanation about changing CTR, EPC an even traffic levels
Yeah, no explanations whatsoever.
No shifting market trends, better competition, more competition (more supply than demand), advertiser AdWord budget cuts, more browsers using ad blockers, demographic changes, weather impacting online activity (49 states with snow!), nope, nothing could explain any of it except a good old Google conspiracy.