Does anybody else feel slightly uneasy about the modern practice of requesting user account information to gather all social links of a user (email is worse than MySpace, I guess, but still). <p>I wouldn't want my friends to submit my email-address anywhere, it is hard enough to keep spam in check as it is.<p>Also I think just having such a pesky "recommend me" form is not all there is to viral marketing. Some products can also be inherently viral, if they require several people to use. An example would be a multiplayer computer game. Slideshows and Photos are not that viral in comparison, because you can just watch photos passively.