Comment by p4bl0

This is by Twitter itself, before Musk: "Our results reveal a remarkably consistent trend: In six out of seven countries studied, the mainstream political right enjoys higher algorithmic amplification than the mainstream political left." https://www.pnas.org/doi/10.1073/pnas.2025334119

This is more recent: "We observe a right-leaning bias in exposure for new accounts within their default timelines." https://arxiv.org/abs/2411.01852

You can also find a lot a testimony from users like: https://www.reddit.com/r/behindthebastards/comments/1es2lfd/...

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Now from personal experience (I've been on Twitter since 2007 and used it virtually everyday since then):

I've heard and read a lot of such testimony in particular from user who don't post much or at all and only follow a few accounts. In the last two years they've been exposed to a lot of far right content.

I've seen how the moderation team at twitter took action before musk when reporting (often illegal) hate speech and now just respond by saying that it doesn't violates the platform rules.

I've seen on the contrary people (even journalists) and political or news organization getting locked out of their account following a far right online mob against them, and then having a hard time (sometimes to the point of giving up) getting it back because the moderation team did not act.