There is an article from BBC a couple of days ago that says YES. (I thought of Kninjanin when I saw this article, because his impression of social media has not been all that good...)
Anyway, here is a copy-and-paste from the article, could this be true?
"The UK's top police officer has blamed social media for normalising violence and leading more children to commit stabbings and murders. Met Police commissioner Cressida Dick told the Times social media sites "rev people up" and make street violence "more likely". Fatal stabbings in England and Wales are at their highest levels since 2011."
http://www.bbc.com/news/uk-43603080