People's opinions can be altered by changing the order in which stories are presented. Search engine companies are at best delinquent and at worst complicit in allowing this manipulation to be so easily achieved.
Google is late in providing its enhanced layout and more sophisticated tools. Much of what the company announced is already standard design for Bing, and is common in many professional search based applications.
Trolling is a growing problem online and especially in social media spaces. It clogs up our email boxes, confuses the follower/following counts and throws monkey wrenches into people actively building engaged online communities. I have created my own types based on behavior I have seen.