BLACK LINKEDIN IS THRIVING. DOES LINKEDIN HAVE A PROBLEM WITH THAT? The social network’s tone has long reflected corporate America: staid, monolithic, white. Now Black users are speaking up — and saying the site is limiting their voice.

One day in September, Elizabeth Leiba opened the LinkedIn app and saw a post by Aaisha Joseph, a diversity consultant with nearly 16,000 followers on the platform.

“Ima need #companies to stop sending their dedicated House Negros to ‘deal with the Blacks’ they deem out of control,” read the item. “It’s really not a good look — it’s actually a very #whitesupremacist and #racist one.”

The post was exactly the sort of thing Ms. Leiba, an instructional design manager at City College in Fort Lauderdale, Fla., was looking for. These days, when she pulls out her phone in search of boisterous conversation, hot takes and the latest tea, she finds herself tapping LinkedIn, which since the killing of George Floyd has become a thriving forum for Black expression.

“I go onto Twitter and I get bored,” Ms. Leiba, 46, said. “Then I go right back to LinkedIn because it’s on fire. I don’t even have to go on any other social media now.”

It’s an unexpected development for what has long been the most polite and perhaps the dullest of the major social networks. LinkedIn was founded in 2003 as a place to network and post résumés — essentially, a directory of white-collar professionals. A few years ago, LinkedIn added a Facebook-like news feed that encouraged users to post links and updates, but it has never been a rollicking space. A team of editors helped enforce a mood best described as corporate.