DAVID MCKENZIE and BERK ÖZLER, form the World Bank's relatively new blog "Development Impact" are blogging a series of analyzes about the impact of blogging. The first one about the impact on citations, the second one impact on recognition and effective policies.... so far, their methodology is not too credible, and similar to many impact evaluations they have criticized, full of endogeneity and selection bias... I hope they will improve in the next reports of the series.
and they indeed (as expected) have a better evaluation: http://www-wds.worldbank.org/external/default/WDSContentServer/IW3P/IB/2011/08/29/000158349_20110829130036/Rendered/PDF/WPS5783.pdf
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