See the summary by Kim Osman in the new edition of the research newsletter https://blog.wikimedia.org/2015/08/03/research-newsletter-july-2015/ or read the full paper (linked there). It's a bit separate from what we are doing here (it concerns tweets directly linking to Wikipedia content, rather than to content about Wikipedia and the movement), but should still be of interest.
The study is going to be presented at OpenSym later this month; I'll make sure to attend the talk - let me know in case you can think of particular questions about the paper that it might be worth asking the researcher there.