A recent example of this was "theresawikiforthat", which generated sites like ocamlwiki.com and juliawiki.com that were full of very low-quality information. They are offline now, but the ocamlwiki was consistently toward the top of google search results for a while last year.

Here are some threads from the ocaml/julia communities as they started to catch on: https://discuss.ocaml.org/t/whats-up-with-ocamlwiki/13605 https://discourse.julialang.org/t/whats-the-juliawiki/109335