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There have been two videos by Matt Cutts about this sort of thing:

http://www.youtube.com/watch?v=Z13-yP3Zhns

and

http://www.youtube.com/watch?v=mtbNpeYP_OM

whilst they don't describe the exact scenario that you're talking about, they probably answer the generic question about how Search Engines are likely to view news feeds.

Doesn't really help but have seen the same thing, with the same notice but no way of knowing when the penalty was applied.

Other than drops in traffic, it seems there is no way to know whether the site is only affected by the manual penalty, or by both manual and algorithmic.  (at least the manual action opens the door to a reconsideration request and therefore some feedback)

Hi,

Sorry if you've already checked, but there is some really clear guidance on Webmaster Tools Help here

Only reason I mention it as dealt with similar question about six months ago, and it answered all my questions.

Hi,

As everyone above has said it's almost certain that you've been hit by Penguin 2.1

Without wishing to repeat the advice above, this post has just about everything you need to know about what has happened and what to do next.

Good Luck.

http://moz.com/ugc/ultimate-guide-to-google-penalty-removal

Chris

Sarah, I hope you're going to take credit for spotting this first

it's official ...

https://moz.com/blog/four-ads-on-top-the-wait-is-over