With a goal of improved social media communication by park agencies, the content from seven Englishlanguage North American park agencies' Twitter accounts were counted, interpreted, coded and compared. Trends in usage of Twitter by park agencies were examined by comparing tweets from 2014 (n=764) and 2017 (n=1,395). Special attention was directed to how park agencies address natural heritage conservation and park visitation in their Twitter feeds. Findings support a call for increased bottom-up, less controlled forms of information exchange on official park agency Twitter accounts to enhance interactivity, innovation and stakeholder input.