Until somewhat recently I still had the ability to create sporecasts.. then my last sporecast replicated and since then I no longer have sporecast as an option on the menu. Have Sporecasts been disabled or removed?
Apparently the in-game sporecast has been disabled. I did find and workout how sporecasts are created at spore.com . Create and title your sporecast and then drag and drop your creations into the sporecast. I now have 3 new sporecast.