Prosumer
Summary (from en.wikipedia)
Prosumer is a portmanteau formed by contracting either the word professional or producer with the word consumer. The term has taken on multiple conflicting meanings: the business sector sees the prosumer (professional–consumer) as a market segment, whereas economists see the prosumer (producer–consumer) as having greater independence from the mainstream economy. It can also be thought of as converse to the consumer with a passive role, denoting an active role as the individual gets more involved in the process.
Alternately
Alternately, we could speak of Wikimedia_stakeholders?