Probably no one.
If you are generally interested in a topic read a book, or some webpages. They’re probably better written, you can move at your own pace and you can learn what interests you.
If you want to connect with others with similar interests join an online forum. Or do a short course at a local college or university. Or check out adult learning providers. Or join a club or society. Or a dating site.
If you want to advance your career do a proper course that leads to a qualification. You might even be able to get your employer to fund it. If you don’t have an employer, take a proper course that leads to a qualification. It will actually help you get a job.
If you are an disruptive educator looking for stuff to blog about – what are the long term implications of so many young PhDs dropping out of academia? why are so many posts short term or temporary? why has higher education become entirely focused on economic growth? why is the “Followers of the Apocalypse” such essential reading?