I still check my ex's social media accounts.
Why do you check your ex's social media accounts?
I like to see what they've been up to.
I know you want to see what your ex is doing, but you really should move on. Spending your time keeping up with your ex is a waste of time. Focus on yourself and what makes you happy.
Wow, you don't have to tell me what to do. I check them because know those posts are there only to get back at me.
If that is the case, don't validate that.  If they know that you are ignoring them, they will eventually stop and move on too.