It would seem that it now has a new usage as a way to convey not only a message but also tonality and a sense of irony. The Atlantic have a nice article on the evolution and recent linguistic recognition of the 'prepositional because' phenomenon. Many of us will have seen people replying to questions with phrases like 'because hungry' or 'because internet' on Twitter - I know I have. However, this is not just another example of the internet and social media propagating change with words like 'twerk' and 'selfie' being considered for official recognition by the OED (the latter of which has been), but a possible addition to grammatical rules too.
Language is always evolving - that's the point of it. I wonder though where this evolution stops. And by accepting changes like this and incorporating them into language and linguistics, are we not taking away the slightly rebelious weight that they carry as part of their usage? At the risk of sounding like my Dad, by recognising something that, by it's very nature flies in the face of a rule (albeit only a grammatical one), do we somehow remove it's cool factor?
Personally, I'm waiting for the next Shakespeare to start tweeting his sonnets! Then I'll learn Latin and go and live in a cave.