What is the ruling on addressing the issue of deviant girls in a specific place, naming it on the internet, and is this considered defamation?

The location where the incident occurred should not be specified, in order to conceal the faults of Muslims, unless there is an overriding benefit, such as warning people. The default is non-specification, following the Sunnah (definition), as in the Prophet's (peace be upon him) saying: "What is wrong with people who do such and such?" It is disliked to expose the faults of Muslims due to the corrupting consequences that result, such as public defamation and emulation of evil deeds. In addressing such issues, one should refer to the people of knowledge and goodness in the community.