Lisa used to post often as well but she kinda stopped after the problems I heard they were having in thailand and some people were forcing her to speak up on this.
I think Stans tend to ignore that often times celebrities quit using social media so often is because of the stans in the first place. People give Gaga crap all the time these days for not using social media much but she gets so many toxic comments all the time, even from "fans", that it's not exactly surprising.