From what I can see on both my personal Flattr account (where was never really much going on) and on (more attractive) phpMyAdmin's profile, the amount of people using Flattr there goes down there every month. There was definitely big momentum when it has been introduced, many geeks saw it as great opportunity for making micro payments work. Maybe people who started to use it at beginning are slowly abandoning it (what is true for me as well) and new ones simply don't come that much or whatever else. Anyway I definitely don't have the big picture to see whether is global trend or just my project is more unlucky...
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