4. Get super into an activity they love, that they always wanted to with you, but that you (used to) hate.
Then:
Now:
As far as Facebook knows, you now do this activity constantly.
5. Get a cute dog.
Step 1: Name the dog after your ex. You can go obvious with this one, or choose a nickname you had for them that they hated.
Step 2: Make him/her (the dog) internet famous.
Step 3: When said dog is caught on video licking himself or eating his own poo, post it an *mistakenly* tag your ex. Whoops!
(Oh, and remember to pick a breed they would never choose).