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what does it mean? this just happen this month but a month ago it will show the TITLE and its DESC
From what I have read here, the duplicate filter, if it exists at all, kicks in when the page content is between 10% and 15% duplicated by another page. Having said that I have had many pages stolen and my original page and the duplicate seem to have lived happily side by side in the serps for many months before I force the thief into submission. Perhaps someone else could chime in with a more accurate appraisal of duplicates.
"Similar Pages" is totally unrelated to the content of pages.
The context of the text around links plays a big part in similar pages.
One day I changed the layout of my home page to look like the #1 result - just organized the tables and the HTML sructure the same way #1 did. No change in the SERPs, but the #1 showed as a simillar page to my home page soon after.
Then, as my website start comming up the SERPs, the simillar pages count fell from 31 (the maximum) to 27, where some of the pages link to me, but others don't and they have nothing simillar to my website.
And the most weird thing - I have an inner page which contains a link to AdWords - soon after that the page was showing as a simillar page of AdWords. And now it's gone.
Taking a good hard look at those (I know the turf), my distinct impression is its mostly a matter of third sites which link to both A + B. ['A' being my site, 'B' the "Similar Pages". I presume that the number and PR of the 3rd parties must factor in.
As for similar content, I think it plays the lesser role if any. One "Similar Page" to mine is a completely unreferenced link to Altavista .. no mention of UFOs. Some of the other "UFO" pages in the 35 bear little resemblance to mine.
Google has made an algorithmic crusade to see who links to who, and quickly. I really doubt they would devote a black hole of artificial intelligence to determine which skate-boarding sites are intrinsically similar to others. The same would go for UFOs and any other field.