It is ok thats what facebook is there for.
NO
facebook her/him.
Blocking your ex on Facebook can be beneficial for your mental health and emotional well-being, especially if seeing their posts or updates is causing you distress. It can also help you move on from the relationship and create a healthy boundary between you and your ex. Ultimately, the decision should be based on what will support your healing and closure process.
It is fine if you do.
I gave him pictures of me and told him he could put them on his Facebook and he never did. He put pictures of his ex on his Facebook when they was dating. How come he put pictures of his ex on his Facebook but he didn't with me? I'm jealous of his ex because of that.
It is pretty uncool to be snooping around your ex's facebook or anything else. Move on and stop obsessing is my advice to you.
You have facebook. Written as ¿Tienes facebook? it would be "Do you have facebook?" it could also be a statement to people but most likely in the form of a question. Ex: Tienes facebook? = Do you have facebook?
NO
'Ex' means the relationship is over and since you have a new girlfriend you should be more respectful of her and move on from your Ex. You are heading for trouble if you add your ex girlfriend onto Facebook because sooner or later your girlfriend will find out. Put yourself in your girlfriend's place ... how would you like it if she had her ex on Facebook and kept it from you.
if they are not threating you you are okay
It is never okay to date your friend's ex-boyfriend.