PlanetAll was a social networking, calendaring, and address book site launched in November 1996.

It was founded by a group of Harvard Business School and MIT graduates including Warren Adams[1] and Brian Robertson.

On July 2, 2000, they told PlanetAll members, "We are pleased to announce that we have completed the integration of the key e-commerce related features of PlanetAll.com into our main site at Amazon.com ...

[6] Many of the 1.5 million members were upset by the loss of the utility; one internet journalist wrote later that year that she was "in mourning" for the service.

In addition, the system may automatically notify users of personal information updates made by their respective contacts.

[9]The patent has garnered attention due to its similarity to the initial features of popular social networking site Facebook.