Comment 26 for bug 614742

log for buzz shows:
{"error":{"errors":[{"domain":"global","reason":"invalid","message":"User must have authorized this application to have the following scope in order to make this call: [https://www.googleapis.com/auth/buzz.readonly] Also , make sure your application is using the Buzz specific OAuth authorization URL.","locationType":"header","location":"Authorization"}],"code":401,"message":"User must have authorized this application to have the following scope in order to make this call: [https://www.googleapis.com/auth/buzz.readonly] Also , make sure your application is using the Buzz specific OAuth authorization URL."}}

checking buzz - deleted gwibber - and readded it and it appears in the allowed apps.