Hmm, maybe Telegram...
Almost every people who know cryptocurrency definitely using this social media (especially like me). I like Telegram is simple, fast, secure, synced across all our devices, and of course is FREE

. (I think Telegram is like Whatsapp combined with LINE messenger)...
We can be chatting, share information, and publish some news or content on our own channel and group to the other members who using telegram too...
Also, I see so many ICO Projects promoting their project via telegram by inviting the bounty hunters to join telegram bounty campaign...
Telegram may be the most used platform for cryptocurrency projects, but it is not necessarily the best outlet. You cannot really publish an article on telegram and it remains to easily be read by everyone. Telegram is just a chat app. The messages you post today will move far behind after few days. That is why it is not the best. I honestly will give it to Medium. Articles on medium stays almost forever. You can even get a link to such articles when you use Google search engine for a particular crypto project published in a medium blog.