The problem with using more and more social networks is with every social network you join you need to create profile then invite friends. There is no way to carry your data from one network to another network with out a hitch. Few smart people have already started working on this issue of DataPortability in detail. So lets not worry about it.
In the mean time few web apps have given users an opportunity to share the data. Take an example of adding all your Gmail contacts into Orkut. Login to Orkut and then enter your gmail id/password to invite all your contacts. This seems OK since both Gmail and Orkut is owned by the same company. Your id/password *does not* leave Google.

Where as the same model is used by LinkedIn to add your professional contacts. You need to give your userid/pw details of gmail/hotmail to add the contacts. This doesn’t seem OK even with their promise of privacy and purpose.

Now how would you achieve this with out sharing the credentials?
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