If you've configured mod_GoogPlus Feed but the feed doesn't appear, perform the following steps to help narrow down the cause.
- Set Joomla's Error Reporting to Development
- Access the page displaying the module
If you see something similar to the following
failed to open stream: HTTP request failed! HTTP/1.0 403 Forbidden in
It means that Google's API is refusing your request. To gain an understanding of why, SSH onto your server and do the following (replace $URL with the URL displayed in the error message)
curl -v "$URL"
The output should include some JSON detailing why the request was refused. Access your Google API console and correct the root cause.