Write Unsent Letters
There is little more cathartic than being able to tell someone exactly what you think of them and their behavior. Unfortunately, taking those thoughts to social media is begging to start an internet feud. Get your thoughts out through a medium that is less likely to bring friends and family members down on your head or make you look like a spoiled child. Instead of ranting on social media, write your ex a letter you will never send. This will enable you to say whatever you feel like to you ex without all the resultant fallout. Call your ex names. Curse them. Insult them. Beg them to take you back. Pour your heart out without the need to censor yourself. Then, get rid of the letter. You can shred it, burn it, stuff it in a box or toss it in the trash. Just be sure it does not find its way into the mailbox.
Hardcopy letters are the best for this sort of thing because it is very hard to accidentally stick a letter in the mail. It is easy, however, to click the wrong button and send an email or make a post live. If for whatever reason, you have to write your letter on a computer, write it in a word processor to ensure that your thoughts stay private.