Google Image Index Update

Reports from WebmasterWorld are suggesting that there was a recent Google Images index update.

WebmasterWorld senior member, zeus, said:

I noticed some of my sites have got more images indexed on google image also a little change in rankings, but still no improvement on the filter "Moderate SafeSearch is on " which still filters to mutch good content which has 100% nothing to do with adult stuff, but maybe that comes later in this update, which is often the case with the image update.

So is that SafeSearch feature that WebmasterWorld.