Tesla opened its fourth quarter conference call on Wednesday by fielding questions submitted through a mobile app by some of its mom and pop investors.

It's was a far less contentious call than the one last May, when CEO Elon Musk sparred with professional Wall Street analysts over their questions about Tesla's production issues and cash burn rate. Musk lashed out at one analyst who asked about Tesla's capital requirements, saying "Boring, bonehead questions are not cool." He later apologized.

Earnings conference calls normally feature a polite repartee between company executives and research analysts and are seldom open to questions from news reporters (CNBC's Phil LeBeau did slip in a question during the October call) much less ordinary investors.

But Musk's conference calls in recent quarters have been a little higher-octane.

The call in May featured a surprising guest in the form of a 20-something YouTuber and small Tesla shareholder named Galileo Russell, who was allowed to pepper Musk with questions.

Russell, whose YouTube channel is a grass roots forum for Tesla shareholders, teamed up with a tech startup called Say that is backed by hedge fund manager Steve Cohen's private Point72 Ventures. Say is a mobile app that aims to give individual shareholders more power in voting on company issues and communicating with companies as shareholders.

Say was the app gathering the questions submitted to Musk on Wednesday.

Musk and other executives on the call ended up answering four of them, including one about how a recession could affect demand (Musk said he still sees orders of 500,000 for Model 3 in a recession environment), the time-line for self-driving features (Musk said they're working on traffic light technology and navigating complex parking lots), batteries (wouldn't comment on product development), and Tesla semi and Model Y (Musk says they might unveil the Tesla pickup truck this summer).