Have been nuked again. Three doorways dropped. Single page .com domains which all featured in the top 10. Feels like a competitor reported that they were doorways OR a human inside had a peak and dropped them. Cannot believe that their automated spam filter nailed them. Unless they are setting number of page parameters. Site has to have a certain number of pages to stick!
Also, have a feeling that sites which feature prominently in the ODP are being given a boost.
"In what way were these doorways similar to each other?"
1) All one page domains. 2) Same algo. 3) all three had action text - i.e click here to enter the world of ""
My feeling is that AV is penalising sites which consist of less then a number of pages. Possibly sends a internal links counting spider to pages which have been recently indexed on a random basis. If the number of internal links are less then a certain number - site gets dropped.
Pete, I think you might be right. All I can suggest it to make each page differ from each other enough so that a simple comparison will not throw it out. Different primarily in the text and meta content. I don't think it's quite so important to worry about the picture placement, but you might like to add insurance by renaming some of the pictures.