Better check your Facebook settings before posting a party invitation online.

A teenage girl in Germany who forgot to mark her birthday invitation as private on Facebook ran away from her own party when more than 1,500 guests showed up and around 100 police officers with horses had to keep the crowd under control.

A spokesman for the Hamburg police said Sunday that 11 people were temporarily detained, several girls wearing flip-flops cut their feet on broken glass and a garbage can was set on fire at the 16th birthday party in Hamburg on Friday night.

Spokesman Mirko Streiber said that the birthday girl, identified only as Thessa, fled the party and hid, but that "nonetheless the party was quite a hit."