Plaxo was one of the first social networks to adopt
OpenSocial and according to a post at Mashable, this has proven a good decision:
Plaxo Sees Exponential Growth as First to Use OpenSocial
. The main advantage for Plaxo is that it can build a social network from a glorified address book by leveraging the ability to aggregating other social networks.
If you are on plaxo, just add me to your pulse, I'd be happy to see you.

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