This isn't major, but I've noticed that when creating a notification that exceeds the 150 character content limit, the REST endpoint returns a successful status code and a success response {"postnotificationstatus":"posted"}, but never actually delivers the notification. Would be great if it instead returned a failure status code to let developers know their params are causing things to bomb.
I haven't checked what the behavior is when the content limit is exceeded through the opensocial container.
Thanks,
Ed