13. That feels... kind of okay. I'm thinking about cutting down on some cus some are similar enough to feel like double load, even though they're actually not posting the same art most of the time.
Then I think it's about the same number on my fandom-account (12-14 groups, dedicated to various fandoms) and there I REALLY could cut a few out cus they DO post about the same art in several groups there... I guess it's a bit more common in Fandom-groups than it is in OC-related groups (since I separate them like that, yes).