lammert - 12:30 pm on Mar 24, 2005 (gmt 0)

I have actually noticed quite a drop in my adsense revenue lately, as opposed to any suspicious clicks...

Other posters also mentioned that they first saw their earnings and CTR drop for some period before the account was disabled.

Could this be due to an automatic "invalid clicks" filter at Google which tries to filter out inappropriate clicks, and when this reaches a certain level the account is disabled? I remember some time ago there was a discussion that such a filter might use overcompensation: when N invalid clicks are detected the statistics are compensated for N*f clicks, where f is a factor larger than 1 to compensate for undetected invalid clicks.

If so, dropping CTR might be a sign for invalid clicks, where until now I was thinking that unnatural increasing CTR was the sign for invalid clicks.