Adsense no longer accepting social media traffic?

I was posting for a friends website on my pages as well as my own website and we noticed a sudden drop in rpm. Wondering if anyone knows anything about this? Also since adsense is going down the drain for me and social media earnings, anyone know a better ad network that I can use. Perhaps something that pays about $4-10 rpm. My adsense ctr was usually around .5-3%