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Snapchat is going to put ads next to messages from your friends
(www.theverge.com)
This is a most excellent place for technology news and articles.
I think you mean 'direct' messaging
Maybe. I've only known Snapchat used for sending pictures of one's privates, which is quite direct now that I think about it.
Have they fixed the issue where anyone with the URL to your pic can see it?
As far as I've read, it's never been private, let alone encrypted.