Personal blogs and twitter are the main outlets. See <a href="https:&#x2F;&#x2F;twitter.com&#x2F;mbeisen" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;mbeisen</a> and <a href="http:&#x2F;&#x2F;www.michaeleisen.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.michaeleisen.org&#x2F;</a> for an example of an extremely publicly engaged scientist. You can poke around his twitter graph to see other hubs.