Fig 1. The proportion of Wikipedia editors who are human, vandals, and bots and the type of editorial activity in which they are involved.

A language edition to the left has a higher total number of edits than one to the right. (A) Bots comprise a tiny proportion of all Wikipedia users, usually less than 0.1% (not visible in the figure). (B) However, bots account for a significant proportion of the editorial activity. The level of bot activity significantly differs between different language editions of Wikipedia, with bots generally more active in smaller editions. (C) A smaller proportion of bots’ edits are reverts compared to humans’ edits. (D) A smaller proportion of bots’ edits get reverted compared to humans’ edits. Since by our definition, vandals have all of their edits reverted, we do not show them in this figure.