Warsaw - A Polish court has fined a 23-year-old woman who admitted posting an invitation to an outdoor spring party on Facebook.
The party drew more than 20 000 people. Some of them were rowdy and got into fights. One man was injured after falling from a cliff.
The court in the southern city of Krakow said the woman failed to seek permission or ensure security during the party in April on the city outskirts.
The woman - identified only as Anna K, in line with Poland's privacy regulations - was convicted of organising an unauthorised gathering.
The court said the place is "extremely dangerous" because of its water tank and rocks. It fined the woman 2 400 zlotys (R8 000).