There's "going viral" and then there's just plan sneezing! Sites like Tagged are WAY too aggressive in helping you "send invitations to all your friends". As part of the sign-up process, you can provide your web email account log-ins, and they will help you connect with friends already in the system. They also "let" you send invitations to other pple in your address book who aren't already members. However, Tagged DEFAULTS to sending invites to everyone and doesn't warn you that you're about to send hundreds or thousands of emails. Clearly their intention is primarily to spam their member's networks and they have no confidence that their site has real value for users.
Reputable social networking sites, like LinkedIn, Facebook or Socializr, also let you tap address books, but they default to NOT blasting all your contacts.
Take it from personal experience, use caution when giving pseudo social network sites like Tagged access to your web mail accounts. Tagged, you've been cited!
