When will you announce?

I'm 11 weeks today and have seen and heard (strong) heart beats twice. This is our first baby and are so excited! We told our parents and siblings and other very close family right away (we knew the risk but would've told them all if the worst had happened anyway). When did/will you officially announce via social media/other means publicly? We weren't originally going to do anything via social media but changed our mind last minute. I'm thinking sometime between 13-15 weeks but I really don't know! Thanks!