Would talking about someone(or their actions) indirectly on social media(I.e Facebook, twitter, etc) publicly without mentioning their names but their actions be considered haram? So some guy (named X for sake of story) told someone to ask me about my opinions on X to see if I would slander him, basically set me up. I found out that X set me up. So I went to Facebook and posted “this guy really tried to set me up, how low in life must you be to care about what I say” I didn’t mention any names.

Would that be halal or haram for me to post on facebook?

It seems to be quite an ambiguous post unless people know who you are indicating. It may be better to refrain from posting these types of things though. Take the lesson out of what happened to you and move on from it