The only reason we let her use other sites is because they allowed her to engage with things we encourage her to do:
Youtube: She loves to draw and watched lots of tutorials. Shes also a huge Mark Rober fan. Youtube has lots of great content, but also lots of questionable stuff so its time to be done with it.
Discord: She talks to many of her church friends and cousins on that platform. She even plays D&D with a family group which is pretty cool; they use Discord for video chat.