Didn't Kim Dotcom say you can't trust Mega anymore?
http://www.wired.co.uk/news/archive/2015-07/31/kim-dotcom-me...
http://www.wired.co.uk/news/archive/2015-07/31/kim-dotcom-me...
When I want secure chat, I use Signal from WhisperSystems. Yeah it has usability issues, but it's obvious it's hard to do really secure and secret chat.
http://www.forbes.com/sites/andygreenberg/2013/04/17/where-k...
Not mentioned in the article is his involvement in the AT&T calling card fraud conspiracy (estimated losses $20 million) in the early '90's. It is that case that put him on the US Secret Service's radar and he's been on it ever since.