There's quite a few people on this site I'll be putting forward, some really awesome people on here who definitely deserve recognition for that they do. That said, Salesforce do look for engagement on multiple channels so do as much as you can! :)
As has been pointed out elsewhere, engagement in a single channel, however deep, is unlikely to be considered enough to make it as an MVP. That said, the decisions are taken by Salesforce and the criteria are not public, so those of us in the program don't know exactly how things work, but we do know what got us and others there.
For anyone who is targeting MVP status and would like some assistance or advice around engaging with a wider audience, we have an MVP mentorship team tasked with providing exactly that. I'm on this team so if it is something you are serious about, reach out to me and we'll see about finding you someone in your timezone to help you.