I agree with Eros, and just to say my opinion I don't see a damn point people do that new "trend" that they think they'll help the people in france putting the hashtag #prayforparis and so on, and even putting france flag and their face on it, terrorist attacks have happened to 100 more countries and people do this only for france, it doesn't even concerne you at all, if you haven't lost your beloved ones in paris, or live in France.
You can feel sad, but doing this is very stupid for my opinion, also the people who do joke about isis, that's not cool, as people may get offended and imagine if someone's beloved one has passed away of it.
Kind regards,
D00M