Hundreds of teens and young adults gathered at Robert W. Crown Memorial State Beach in Alameda over the weekend for a social media-promoted "beach takeover," with police reporting fights, assaults and ...

The clips show crowds gathering and the chaos unfolding in real time. Social media is fueling the surge. Teens are organizing meetups through social media, and the gatherings can quickly escalate into ...

Chaos has hit the beach in one of San Diego’s most exclusive coastal neighborhoods as teens are taking part in informal “fight clubs” — and police say social media is fueling the surge. In recent week ...