I won't speak on fanbases but saying creators shouldn't use or look at twitter is quite hard/impossible nowadays. Its the go-to in terms of advertisement and just getting your work out there. Even if you're in a hugely mainstream magazine like Jump, your work won't necessarily gain attention, Momiji being a great case of this. It gets attention without a doubt but its nowhere near other series. Its niche within niche though in another magazine this level might be very noteworthy. Its just unavoidable to look at social media and try to drum up support, even giving the fans what they want so as to get this. To begin with, Jump has always been a magazine where the readers are placed at the forefront. If your work doesn't appeal to the readers, its cancelled. Giving the fans what they want while also putting in your own twists is one way of doing so and I believe the main way to hit it big in this magazine. Almost every hit series in the magazine has done this and has tasted success. Neverland put the fact that its been getting a lot of interest on SNS on its volume wraparounds.
One way to possibly get social media support without being in direct contact is to do like Oda, have a middle man manage the social media accounts. He cares about reaching as many people as possible but he doesn't always talk directly though he probably does look through as he's probably connected to the internet as well.
