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Disclaimer: I haven't still used the domain datasets as they are fairly new.
I believe you can do both parts of your questions by using the VIDEO_ON_DEMAND datasets of Amazon Personalize.
For the first part of the problem, the VIDEO_ON_DEMAND dataset gives you the option to add metadata such as the CONTENT_OWNER. [1] Even if Personalize wouldn't know who you are following, it will know you are interacting with content from a user, and that should have a similar effect.
For the second part, handling the cold start problem, you can use incremental uploads, and Personalize will retrain the model every two hours [2]. If you also use events for tracking user interactions, recommendations for new users will get relevant faster. [3]
[1] https://docs.aws.amazon.com/personalize/latest/dg/VIDEO-ON-DEMAND-datasets-and-schemas.html [2] https://docs.aws.amazon.com/personalize/latest/dg/importing-domain-dsg-data.html#incremental-import-domain-dsg [3] https://docs.aws.amazon.com/personalize/latest/dg/recording-events.html
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