Thinking about this when working on a social network (yes, I know) as a pet project at spare time, I've got a question: are there any tools for handling imprope

Thinking about this when working on a social network (yes, I know) as a pet project at spare time, I've got a question: are there any tools for handling improper text/images automatically? I think there are some lists of "bad words", but not sure if they are available for most widely used languages. But are there libs/SDKs/online services that I can feed a picture and they will tag it as potentially improper, for example porn or some swastikas, so I can pre-moderate manually only such images? Looks like it could be a nice and useful service.