Whenever you click on span buttom to report , you are helping Google to provide you better Gmail service , so please do report when you receive unwanted emails from strangers
Now , if you have subscribed to a websiteI(news letters & mailing lists, feeds ,updates) long before but now you want to unsubscribe but finding difficult to find unsubscrile link , Google has added a new feature to its Gmail bag: single click of unsubscribe: click on report span you will get a dialog box as can been seen in the picture
