Tashfeen Malik, the woman involved in California’s mass shooting, is the latest in a growing number of extremists using social media to publicise their crimes. Facebook said she used an alias to praise IS online shortly before, or during, the attack. Malik's posting echoes similar bids for attention by violent perpetrators; for example, a disgruntled Virginia TV broadcaster recorded himself shooting two co-workers and then posted the video online, and a Florida man killed his wife and shared a photo of her body on social media. Facebook, YouTube, Twitter, and other social media companies do their best to block or remove posts that glorify violence, but experts say it's an uphill battle. The advent of new services enabling people to stream live video from events makes the task more challenging. Online services use automated software to help detect posts depicting or encouraging violence; however, all the policies in the world won't help unless companies devote staff and resources to enforcing them.