My ex keeps on contacting me on Facebook, please read and give your suggestions. What would you guys do?

If you don't wanna keep in contact with your ex, just send a PM telling him or her that you are uncomfortable that they are contacting you. And if they don't stop you will need to block them from your fb.

If my ex-was contacting me on facebook the healthiest thing to do would be to block his account in order to move on.

it all depends on why you broke up with him or her and whether you have a relationship now. if you do then you should just block him and forget about it ( you definitely forget about him ). But if you don't have a relationship, you should ask yourself why you guys broke up and made clear with them whats their intention. if you think that they have changed to be better for you then maybe you could consider giving them a chance. Not by dating right away but by talking casually first and see how it goes.

If you wanna talk with him just answer. If not, tell mit politely to leave you in peace and block him if he does not stop.