> Perhaps sites uprated for having been DDOSed could be marked as such. We already have to make many decisions about the trustworthiness of news sources, so maybe it's just another factor.

Then I'll DDoS your already highly-ranked site just to trigger the "untrustworthy" mark for it in the results.

The problem with going social is the infinite capability of humans to game things like that. I strongly sympathize with the desire to "make the whole problem go away" instead.