However, the attack was started by an Orkut underground community which also has a presence on Facebook (Thanks Tony via Comment). As you can see from the image above, this community is all about business and about a numerous amounts of hacks.
Though the attack was not harmful at all, it was definitely malicious and spread like a malware. Orkut and Facebook are two competing social networking platforms, so it was really not surprising. However, Google does have to rein in such communities and clamp down on them if they want to be really realistic about being competitive.
Quite recently members of 4Chan and Tumblr went after each other and took each other down too, so is rivalry brewing between users who are loyal to a particular website? I think so.
I have contacted both Facebook and Google/Orkut for their response on this, will update this post once they respond.
Update: Google responded back to me and have promised to look into the matter and take appropriate actions. I will update this post when there is more to share.