When trying the demos on this page: http://reference.wolfram.com/language/ref/service/Twitter.html
I get the connection to Twitter just fine, as well as the UserData. But when I try to get the FriendNetwork I get a error:
Import::fmterr: "Cannot import data as "JSON" format.
See attached file for screenshot
So I'm not sure what's going on and would like confirmation that others get it to work just fine.
It appears that this happens for some twitter accounts. I'm not sure why:
Currently, there doesn't seem to be a workaround, but it has been reported to the developers.