PALO ALTO, California — Tashfeen Malik, the woman involved in this week's Southern California mass shooting, has another claim to notoriety: She's the latest in a growing line of extremists and disturbed killers who have used social media to punctuate their horrific violence. A Facebook official said Friday that Malik, using an alias, praised the Islamic State group in a Facebook post shortly before — or during — the attack. Malik's posting echoes similar bids for attention by violent perpetrators, including a disgruntled Virginia broadcaster who recorded himself shooting two co-workers and then posted the video online and a Florida man who killed his wife and shared a photo of her body on social media.