- “Send Feedback” button is located in the lower-right corner of your browser window when logged in and is the best way to send suggestions or indicate problems
- Official Known Issues page for reporting bugs and issues
- Informally vote on Unofficial Feature Requests
- How to Conduct a Poll on Google+ by Dain Binder
- (Advanced) Send feedback on interactive page elements (e.g., Share Box) using a bookmarklet by Matthais Ernst
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