This thread and the report deserve much more attention than they've gotten.
Note that reading the pdf report at a decent font size involves some side-scrolling on all but very large screens, but the report is well-written, fairly brief, and definitely worth a read. It leads to numerous side areas also worth exploring. The overview it presents is striking.
- Information manipulation gives attackers the ability to influence what a victim sees on the Web in a way that survives cleaning the client machine. - The act of personalizing search results and news feeds leads to a narrowing of viewpoints, a form of automated censorship. - Attempts to increase the uptake of a given viewpoint can be detected based on certain characteristics.
On the same landing page linked to above, there's also a Georgia Tech Cyber Security Summit video, which unfortunately is 164 minutes long. It may take some real dedication to go there. It's very well produced, though, with excellent content in the sections I viewed, and you can jump through it to pick up various discussions.
Note that there's a semi-parallel thread in the WebmasterWorld Google Search forum, deriving from an article which reports on the above pdf...