No Market Share movement for Flattr yet sorry.
Get a list of 22,736 websites using Flattr which includes location information, hosting data, contact details, 8,637 currently live websites
which includes 3,034 domains that redirect to sites in the list. 17,133 sites that used this technology previously and 2,301 websites in the United States currently using Flattr.
Distribution of locations of all Flattr customers we've ever tracked.