I am pretty sure I am experiencing this issue as well. I can't verify it, yet. I assumed it was an issue with OAuth, but it seems like that it is the same issue.
- [twitter-dev] Problem in past 48 hours: friendships/create... PJB
- [twitter-dev] Re: Problem in past 48 hours: friendshi... Paul Kinlan
- [twitter-dev] Re: Problem in past 48 hours: frien... Shannon Clark
- [twitter-dev] Re: Problem in past 48 hours: friendshi... David Dellanave