The ongoing feud between Elon Musk and Jeff Bezos took a strange and personal turn today when Bezos posted a tweet questioning Musk’s philanthropy and clearly implying that the Tesla CEO doesn’t do nearly as much as he could to promote the welfare of others.

Musk didn’t reply directly to Bezos on the social media platform, but instead tweeted a joke just minutes later:

But Elon didn’t stop there. He went on to post a few more jokes on the topic:

As of press time Bezos had yet to react to Musk’s tweets – all of which were quickly deleted soon after Elon posted them. More as this story develops.