https://notado.app has had support for Tweets and multiple other types of UGC (like comments! from everywhere!) for a long time now. I am the main developer and you can look at my comment history here for more details on the philosophy behind the project.

You can also check out some of my feeds of saved content[1] to get an idea of the breadth of support for UGC.

There are some articles available too if you don't mind longer reads.[2][3]

[1]: https://notado.app/feeds/jado/software-development

[2]: https://lgug2z.com/articles/notado-07-2023-update/

[3]: https://lgug2z.com/articles/the-bookmarking-data-model-is-wr...