My takeaway from watching from the sidelines of Science Blogging London 2008
I've been browsing the FriendFeed Room.... evidence. Systematic study. Peer-reviewed. Published. (good news for me, if I get in gear)
A lot of what's coming across is people claiming value and other people not getting it. Or maybe, people claiming different benefits and arguing against each other. Also unsupported (like those I sometimes make (blush)) statements about why blogs are good/bad/indifferent for scientists/the public/policy makers/science in general.
Most of the action in journals is still in the letters and editorial bits - not based on systematic evidence, but journalistic inquiry or personal experiences. Well, and also in the CS literature about information retrieval, sentiment analysis, geotagging, community detection, etc. Maybe in the education literature a bit a few years ago about the pedagogical value.
I have lots of ideas for qualitative studies, but not so many for quantitative... but that's probably what's needed to get attention.