The project team more often notifies updates about their project through social media, because in general social media users are more widely used. Especially telegram, the development team will easily provide information quickly. So I don't think this is a problem.
Of course, its bad when Ann isnt updating and the team isn't interacting in thread. But this doesn't always mean that the project is dead or scam. Ann's thread is important during the ICO. The main exchange of information is in the Telegram channel. But when there is no update on social media, this is obvious pointer to scam, but then its too late for investors to pull hair in a rage-the money already invested.