Duplicate content filter?

[irobotix]

Can someone give me an idea on what a duplicate content filter is?

Thanks!

[scisoft]

It has been to some extend discussed this forum, but I do not remember the exact thread id. The name was something like "Google get the duplicate content fixed", started by WilliamC, probably early april, with many unhappy responses.

[adore]

When two pages are exactly the same (or very, very similar), then one of them is given a penalty by Google - its rank drops down significantly.
Generally, Google leaves older site, with higher PR, etc.