For instance, I texted Scooter Braun’s public number several times asking for updates on Justin Bieber’s wedding weekend and have yet to receive a response.

But you could get lucky. Earlier this month, Gary Vaynerchuk, an entrepreneur and marketer who uses Community, tweeted a video of himself responding to messages on his iPhone.

Mr. Vaynerchuk said he has been a Community user for about six weeks and so far loves the platform. He said Community does a good job of organizing the messages. He goes through and responds to them within the Community app, and those messages are then distributed to his fans via text.

Mr. Kutcher has also teased personal responses. His initial text reads: “hey it’s Ashton. this is an autotext to let you know I got your message, everything else will be from me. make sure you click the link and add yourself to my phone so I can respond to you.”

While many high-profile stars use Twitter and Instagram to promote their work, make announcements and engage with fans, social media platforms have issues: Algorithms are increasingly crowded, making it hard for stars to ensure that their messages reach their intended audience, and responding to one DM gives a user unlimited access to their primary inbox.

“This is basically what I did on Twitter from 2007 to 2011,” Mr. Vaynerchuk said of Community. But he added that the conversations he has had through Community have been different. “I think some people are more comfortable asking personal questions on text than even on DM,” he said.