Blind said it became aware of the problem on May 4th, right when word got out of a Tesla security team email warning against leaks. This is the only company blocking access at present, the social network said, although Uber is known to have blocked Blind after Sarah Fowler's post detailing sexual harassment at the ridesharing firm. Uber lifted the block after Travis Kalanick was replaced.

We've asked Tesla for comment.

There could be practical reasons for cutting off access to Blind. Even a well-meaning employee could theoretically reveal confidential practices that have little to do with working conditions. And when posts aren't vetted, this could also hurt a company's reputation if a claim is false. However, blocking access also prevents staff from sharing their experiences in a space where they're safe from the possibility of retaliation. What Tesla gains in secrecy might be lost in giving workers a place to vent.