It is not easy to talk about mental health issues or any other stigmatizing or threatening matter. That is one of the reasons why people take recourse to anonymous chat sites like Omegle and sharing apps like Secret. This leaves them even more vulnerable to attacks. However, there are startups like 7 Cups of Tea that go one step beyond and connect people anonymously with trained active listeners. If creating a support mechanism is not possible, a partnership with a provider of such service could help these anonymous networks. A responsible website/app must actively provide some amount of support to users. Tumblr has implemented it really well.