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Start deleting... Build a script to delete all content under 1000 words. That's the only thing I've seen that works.
Be careful. This is a completely unproven idea and there is evidence to the contrary too.
These are sites about news, nothing to sell, and LOTS of pages :(
especially if those pages are attracting some decent backlinks. you might be doing yourself some damage by deleting them. i would at least check what the traffic is like on those pages before deleting them. if their traffic hasnt gone down then you should leave them alone
The answer to Panda, though I didn't like it either, is niche specific, quality sites that cater to readers who love similar content as what they're searching for.
I've learned that Google likes to keep things simple. Believe it or not, Google has all the rules outlined, and if we followed them patiently, Panda could be our best friend.
in that case I have no clue. I'm sticking with the plan though