Using the hashtag #notinmyname, young British Muslims have been denouncing the acts of terror group "Islamic State."

The #notinmyname campaign was initiated by the London-based charity Active Change Foundation, which aims to "prevent violent extremism in all its forms." And Muslims in other countries are also using the hashtag, which has been receiving media coverage around the world.

And non-Muslims are also chiming in.

But not everyone agrees about the effectiveness of the campaign.