This is the best summary I could come up with:

In 2015, that community turned Reign’s dashed-off hashtag — #OscarsSoWhite — into a viral campaign that sparked real-world change, pushing the Academy of Motion Picture Arts and Sciences to triple the number of Oscar-voting members of color.

Meanwhile, some competing services — notably Bluesky, the invitation-only platform created by Twitter co-founder Jack Dorsey — have strained relationships with Black users by failing to police racist attacks.

Touré, a host at TheGrio, a media network geared toward Black Americans, has more than 220,000 followers on Twitter, but said his interactions there leave him so “triggered and tired” these days that he rarely posts.

Black Twitter popularized any number of cultural memes, as well as slang phrases like “on fleek” (perfectly done or exactly right) and “Bye, Felicia,” a line from “Friday,” the 1995 Ice Cube film, “often used online as a dismissive farewell,” according to the website KnowYourMeme.com.

Dorsey once appeared with Black Lives Matter activist DeRay Mckesson — now an adviser to Spill — wearing a company-made T-shirt bearing the slogan #StayWoke.

Instagram and TikTok emphasize images and video — not text — and feed users content from strangers and celebrities, diminishing the ability to build and elevate a personal network.

I’m a bot and I’m open source!

As I understand it, one of the major issues with moving to e.g. Mastodon is that the Fediverse doesn't implement blocking in a way that you'd expect, at all. It's effectively impossible to block someone the way we're used to blocking in places like Twitter, Instagram.

I have also heard a lot of stories from Black folks about anti-Black sentiment on Mastodon.