The current read-only API only lets you see the things you post, not what is posted by people in your circles. The limitation is that there is no API for retrieving your circles, so the only content in your stream is what you've posted :(
The current read-only API only lets you see the things you post, not what is posted by people in your circles. The limitation is that there is no API for retrieving your circles, so the only content in your stream is what you've posted :(