Hello, I’ve noticed this happening to my sites on SimpleCorp too. And if you look below Site5′s Twitter feed has stopped so I think they will want to get on a solution soon. If anyone is reading from Site5 this may be of interest https://dev.twitter.com/blog/planning-for-api-v1-retirement
It seems that people will general have to upgrade in accordance with the new API.
Hope there is a fix soon!