Yeah some project are damn too lazy to update their social media account, to me it is among the things to look out for when scouting for a new project to invest on, because if the social media of that project is still active it means the team are keeping in touch and also updating the public, once the social media no active anymore better start to run as fast 
Updating the community is very important, especially via social media posts. However, if a project doesn't update too often, it might be because team is busy working or there is nothing new to update. But if updates stop rolling out for a long time, it's a sign to dump and move on. Also be careful, some new projects updates so many times daily yet they scam at the end.