Dupes? In my Netvibes? It's more likely than you think.

Since at least Monday, all the feeds I’ve subscribed to with Netvibes have been suffering from massive amounts of fake “new” entries; that is to say entries I’ve already marked as read are being reported as being unread. This has occurred occasionally in the past with individual feeds (Boing Boing being particularly susceptible), but never to this extent either in frequency or breadth of susceptibility. So it’s not likely to be due to the feeds themselves, but rather a flaw of Netvibes.