DENVER (AP) — An apartment complex near Colorado State University that used Facebook to advertise “the biggest pool party of the year’” got more than it bargained for — at least 2,000 people, most of them college students, showed up.

It wasn’t long before the police followed.

Four people, including two CSU football players, were arrested at the Fort Collins apartment complex on Saturday. Ten people were taken to the hospital, most of them for overconsumption of alcohol or minor injuries.

“Some people came from as far away as Denver for this back-to-school party,” Fort Collins police Lt. Hal Dean said on Monday.

The party’s Facebook page had nearly 3,000 registered people. Dean said police estimated at least 2,000 people showed up at the complex about 65 miles north of Denver. Officers had to shut down surrounding streets while they cleared the complex.

The use of social networks such as Twitter and Facebook to spread word of everything from parties to freedom movements has increased exponentially in recent months. In some cases, the events have led to
street trouble.

In Los Angeles in July, a simple tweet by DJ Kaskade telling his followers about a free block party lured thousands of raucous ravers to the landmark Grauman’s Chinese Theatre.

Things turned rowdy, with revelers hurling bottles at police and some jumping on a squad car.

In Fort Collins, firefighters and ambulance crews told police of the out-of-control party at the Ram’s Pointe apartment complex.