About once a week, GO SMS Pro "receives" (I don't know if it comes from somewhere or if it's written into the application) a nag message from "firstname.lastname@example.org" along the lines of:
Most of users loves GO SMS Pro because of themes. Thinking of cool & stylish messaging experience? Try out another bestseller: ColorGlass Theme (Apply it through menu->theme)
It's extremely annoying. I believe I've logged out of GO Chat (though it tends to log itself back in without asking and won't stay disconnected), and have tried going through the app's settings multiple times without finding any way to kill these notifications. They're driving me batty.