Quantifying online citizen science: Dynamics and demographics of public participation in science
Fig 1
The number of individual accounts created since 1999 (the beginning of SETI@home) on online citizen science projects in three different categories (Computing, Sensing, Analyzing, see text).
The three categories show strikingly different dynamics, with almost no growth for Computing, but increasing growth for Sensing. The dashed lines represent a linear extrapolation between the last two data points in the dataset (the gap is due to the unavailability of data in that time period).