Orkut is a property of Google and is suffering from a major XSS (cross-site scripting) attack. The worm is called “Bom Sabado” which means “Good Saturday” in Portuguese, an official language in Brazil, where Orkut is still big in the country.
I don’t use Orkut and never registered with the social networking service before but if you have an Orkut account, you are advised to stay away from the site until the worm has been isolated and the security vulnerability of the site has been patched. Of course, never click on any suspicious links.
Social networking websites are never safe from worms like these that spread very fast because they are automatically sent out to all our contacts. Twitter was a victim for quite a few times. The same goes for Facebook. I think that if everyone learns to use these websites responsibly, we should be safe.