Here's an example of how you can regularly communicate with your shareholders, without the need to put out a PR every time. It's from a company called Fission Uranium (not invested myself):
Welcome to Fission Uranium’s CEO Corner. Here Fission’s CEO, Dev Randhawa, talks about a variety of issues — from industry events and items of industry interest to company news.
http://www.fissionuranium.com/ceo-corner/2015/
Now wouldn't it be nice if we would have something like that?