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I don't think it'd make any difference. In the list you linked, only a few of those provide log-in with oauth. Letting people log in with Google won't let us import data from e.g. Letterboxd etc. Even if Letterboxd provided log-in with oauth, you'd still have to go through another authorization flow if you wanted to import data from an additional service.

The algorithm uses a simple item-based neighborhood model. i.e. if you like song A, Findka looks up all the content liked by other users who liked song A and probabilistically chooses an item that was well-liked. To help the algorithm keep learning, 35% of the recommendations are purely random ("epsilon-greedy"). I describe the implementation here[0], though it's changed slightly (now I export the database every day or so and generate a model on my laptop, then I load it into memory on the server). I experimented with a machine learning-based model (a latent factor model) last week, but it seems I don't yet have enough rating data for that to be useful.

[0] https://findka.com/blog/rec-sys-in-30-lines/

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