Sure, if time wasn't a factor. However, if you were to like green first, the algorithm might show you this "destroy non-green" community before giving you the o

Sure, if time wasn't a factor. However, if you were to like green first, the algorithm might show you this "destroy non-green" community before giving you the opportunity to like other colours. Similarly, purely out of chance you might be given the opportunity to like the "destroy non-green" community before the "destroy non-blue" community. Maybe what we can take from the fact that the writer ended up shown/liking both left and right views is that the algorithm doesn't give a very strong weighting to negative correlation; i.e. even though people who like left-wing pages (presumedly) don't like as many right-wing pages; facebook still gives users the opportunity to like both. And possibly will not necessarily bias on one side of apparently conflicting interests when choosing what to present in the news feed.