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Plaxo was an pioneering online address book service launched in 2002 by Sean Parker, Todd Masonis, and Cameron Ring. It allowed users to store and synchronize their contact information across various platforms and also included early social networking features by helping users keep their address books up-to-date automatically when contacts changed their information. Plaxo gained significant traction for its innovative approach to contact management. In 2008, Plaxo was acquired by Comcast for a reported sum between $150 million and $170 million, with the aim of integrating its services into Comcast's offerings. However, Plaxo was eventually shut down by Comcast, with the service officially ceasing operations on December 31, 2017.
Served as the central hub for Plaxo's engineering, product development, marketing, and business operations for its pioneering online contact management and social synchronization service.
Likely featured a collaborative, open-office environment typical of Silicon Valley tech companies of its era, designed to foster innovation and rapid development. No specific architectural marvels publicly noted; focus was on functional workspace.
Characterized by a fast-paced, innovative startup culture during its independent years, emphasizing technological advancement in social networking and data synchronization. Post-acquisition by Comcast, it integrated into a larger corporate structure while aiming to maintain its product focus until its discontinuation.
Crucial as the birthplace and operational center of one of the earliest successful online address book services that significantly influenced later social networking and contact management platforms.
As an online service, Plaxo was accessible globally to users with internet access. Its primary physical operations, including development and corporate functions, were concentrated in its headquarters in Silicon Valley, USA. It did not maintain a significant number of international physical offices.
1050 E Duane Ave, Suite 100 (historical address, among others)
Sunnyvale
CA
USA
No additional office locations available.
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As of April 2025, Plaxo' leadership includes:
Plaxo has been backed by several prominent investors over the years, including:
The most significant executive event in Plaxo's final operational year (leading up to December 2017) was its shutdown by Comcast. This resulted in the cessation of all roles, including any remaining leadership positions. There were no publicly announced new executive hires during this period as the service was being wound down.
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Specific internal email formats for Plaxo employees are not publicly documented. However, technology companies of its era commonly used formats such as [first_initial][last]@[companydomain].com or [first].[last]@[companydomain].com. As Plaxo is defunct, these formats are no longer active.
[first_initial][last]@plaxo.com (e.g., jdoe@plaxo.com) or [first].[last]@plaxo.com (e.g., jane.doe@plaxo.com) - Hypothetical
Format
example@plaxo.com (No longer active)
Example
0%
Success rate
Plaxo Blog (Archived) / TechCrunch • October 1, 2017
Comcast announced that it would be shutting down Plaxo, its online address book and contact management service. The service was scheduled to be discontinued on December 31, 2017. Users were advised to export their data before the shutdown date....more
TechCrunch / Company Announcement • May 14, 2008
Comcast Interactive Media announced the acquisition of Plaxo. The deal was reportedly valued at between $150 million and $170 million. Plaxo was intended to bolster Comcast's online and social media offerings....more
Early tech media • November 7, 2002
Plaxo launched its public beta, introducing its service for keeping contact information synchronized and up-to-date, leveraging users' existing address books and networks....more
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