When you see an inappropriate or misleading post by a parody/troll page that is taking advantage of a tragedy please refrain from venting your frustration as comments on the post, in fact refrain from any interaction with such pages. This is exactly what they want.
The more people interact with such pages and post the more organic reach the page and post will get, exposing the content of those pages to more people, who in turn will comment their frustration.
This is how Facebook’s EdgeRank algorithm works.
“EdgeRank is the Facebook algorithm that decides which stories appear in each user’s newsfeed. The algorithm hides boring stories, so if your story doesn’t score well, no one will see it.” – edgerank.net
If a post gets more interaction Facebook will identify it as an interesting story and show it to more people.
So lets make social media a safer and more respectful place by removing the power we ourselves give the trolls and parodies by interacting with their content.