Can I ask my boyfriend to stop favoring porn on twitter?
Why do you care about that?
I find it so annoying
It is good to set boundaries with people. Many other people would find it annoying to get porn in their feed all the time, might make you look pervy.
I'm going to confront him even though i know porn makes him happy.
If it is bothering you then you should bring up the issue with him. It is okay to set expectations with your significant other. You could also ask him why he likes it so much.