Security penetration tester found that you can use Google Plus servers to DDoS attack any site. For those who never met the term DDoS is the initials for Distributed Denial-of-Service. It was discovered on August 10, Google was informed the same day and now it is time to inform you. There are two pages that are vulnerable, “/_/sharebox/linkpreview/” and “gadgets/proxy?”. You can request any file from Google+ and it will fetch it and present it to you. You can start simultaneously a huge number of requests, then Google will perform the requests and possibly DDoS the target site. In this case you use Google’s bandwidth as a weapon. The surprising fact is that you don’t even have to be logged into Google+ to start a request. Also the victim site will see the Google’s IP and not yours, although “gadgets/proxy?” will send your IP in Apache log. If you want to be anonymous, use the second page “/_/sharebox/linkpreview/“.
Just a reminder, everything you read is only to inform you and do not try anything that is illegal. You can read more in this site where there are also practical examples and a presentation with video quide.