Talking about mental health is no longer taboo. And with the rise of social networks like TikTok, some therapists have seized the opportunity to develop their business online. The trend is proving to be a big hit with social media users, including some celebrities. There’s no shortage of “therapist advice" videos on TikTok, so much so that among the app’s various worlds, the #TherapyTok hashtag totals some 1.7 billion views. And this hashtag is not the only one to reflect this ever-expanding trend on the Chinese social network: #traumatok has 4.4 billion views, #therapy has 16.8 billion and #healingtok has…