There's two theories on this. Shaving frequently and not shaving at all.

When your facial hair is longer and you shave, there's more of a tug, which causes a lot of irritation. So, if you shave each day, you prevent that and if you don't shave at all, you also prevent that.

I only use a trimmer, so I don't really have to comply to either of these. Well, actually I notice that when I shave with longer facial hair I feel a little irritated afterwards.

Ya when I do shave I trim it low and then shave it so the tugging wouldn't apply to this.

Agreed, I'd either do every day or not at all, to avoid the tug.

Shaving does get rid of dead skin cells, which helps. Just try to shave properly and in a way that doesn't irritate your skin.

For some folks, shaving may irritate acne, and for others it may help.

I never get acne along my jawline, chin, etc. Sometimes above my mouth though. I used to shave with a razor and thought maybe that was why, exfoliating the dead skin, etc. I tried shaving higher up on my cheeks a few times but it only irritated my red marks. For the last couple months I've been just using a beard trimmer, but I'm still not getting any acne in my beard area. So, basically, I have no idea. But that's my experience.

Depends on how you shave.

Shaving itself doesn't affect your acne. It depends on how do you shave, it could help or it could make it worse.