Surfbook

Surfbook was an early social networking service created by Dutch programmer Joannes Jozef Everardus van der Meer in the years prior to his death in June 2004.wikipedia
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Like button

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It allowed users share their information with selected people and approve posts using a "Like" button, and to link to external information.

Social networking service

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Surfbook was an early social networking service created by Dutch programmer Joannes Jozef Everardus van der Meer in the years prior to his death in June 2004.

Dutch people

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Surfbook was an early social networking service created by Dutch programmer Joannes Jozef Everardus van der Meer in the years prior to his death in June 2004.

Programmer

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Surfbook was an early social networking service created by Dutch programmer Joannes Jozef Everardus van der Meer in the years prior to his death in June 2004.

Patent

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Surfbook was based on technologies whose patents were filed by Van der Meer in 1998 and granted in 2001 and 2002.

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On February 5, 2013, holders of the patents related to this site (Rembrandt Social Media, LP) filed a lawsuit against Facebook for infringement.

AddThis

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The company was the subject of a lawsuit by Rembrandt Social Media, which also sued Facebook, for the use of patents that were first implemented in Surfbook and belonging to deceased Dutch programmer Joannes Jozef Everardus van Der Meer that involve the "Like" button.

Facebook like button

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These include patents filed in 1998 relating to Van der Meer's fledgling social network Surfbook, including, according to legal papers filed by the patent holder, the ability for users to approve data using a "like" button.