If you don't usually CW that topic anyway, then post away. I don't generally CW my meta and subpings, since often the CW would make them more pointed than if I left them naked and ambiguous. I'm glad that #selfie is a common CW because they're boring as shit to look at.
Just don't not CW something that you normally CW because it's totally important this time. It probably isn't and you'll lose followers without actually influencing anyone.