I'm the maintainer of the french Yuu Watase website, Sous les Étoiles. I've just opened a Twitter account dedicated to all the news of our favorite mangaka ^^ I know my website is in french which is not useful for a lot of you but I'm gonna write on Twitter in english quite frequently.
Of course, I'm not going to stop my website, it's just a way to talk quickly about interesting stuff. So, if you have an account there and you're interested in, do not hesitate to add @YuuWataseNET. As far as I know, Yuu Watase isn't on Twitter.