In other words, the reduction in bias and slant over time is consistent with a mechanism in
which conservative edits attract revisions and contributions that make an article more
liberal or balanced, and vice versa. Most articles, however, have relatively few edits
and do not deviate much from their initial slant.
Overall, the selection of contributors is a key determinant of the content offered on a
platform. People who contribute may be different from the population at large. People
who contribute a lot may be different from occasional contributors. An important area for
future research would be to investigate the many different motivations to contribute con-
tent and the extent and types of bias that emerges across different types of UGC. For