What Does Plaxo Do?

Total employees26
HeadquartersSunnyvale
Founded2002

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.

Where Is Plaxo's Headquarters?

HQ Function

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.

Notable Features:

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.

Work Culture:

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.

HQ Significance:

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.

Values Reflected in HQ: Initially reflected values of innovation in digital connectivity, user-centric data management, and the burgeoning field of social synchronization. Post-acquisition, these were intended to align with Comcast's broader digital media and service integration strategies, though ultimately Plaxo was discontinued.

Location:

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.

Street Address:

1050 E Duane Ave, Suite 100 (historical address, among others)

City:

Sunnyvale

State/Province:

CA

Country:

USA

Where Else Does Plaxo Operate Around the World?

No additional office locations available.

Buying Intent Signals for Plaxo

Highperformr Signals uncover buying intent and give you clear insights to target the right accounts at the right time — helping your sales, marketing, and GTM teams close more deals, faster.

Notable news
Hiring actively
Corporate Finance
Corporate Finance
Corporate Finance
Corporate Finance
Corporate Finance
*Example signal, not calculated in real time

Who's Leading Plaxo? Meet the Executive Team

As of April 2025, Plaxo' leadership includes:

Ben Golub - Former President and CEO
Todd Masonis - Co-Founder & Former CEO
Cameron Ring - Co-Founder & Former CTO
Sean Parker - Co-Founder
Preston Smalley - Former General Manager (under Comcast)

Who's Investing in Plaxo?

Plaxo has been backed by several prominent investors over the years, including:

Sequoia Capital
Draper Fisher Jurvetson (DFJ)
Tenaya Capital (formerly Lehman Brothers Venture Partners)
Ram Shriram
Michael Moritz

What Leadership Changes Has Plaxo Seen Recently?

Hire0
Exits1

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.

Departures

Preston Smalley (or successor as GM), The role of General Manager, along with all other positions, ceased with the shutdown of Plaxo operations by Comcast.

What Technology (Tech Stack) Is Used byPlaxo?

Discover the tools Plaxo uses. Highperformr reveals the technologies powering your target accounts — helping your sales, marketing, and GTM teams prioritize smarter and close faster.

Plaxo Email Formats and Examples

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

What's the Latest News About Plaxo?

Plaxo Blog (Archived) / TechCrunchOctober 1, 2017

Plaxo News: Comcast Announces Shutdown of Plaxo Service

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 AnnouncementMay 14, 2008

Plaxo News: Comcast Acquires Plaxo

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 mediaNovember 7, 2002

Plaxo News: Plaxo Launches Public Beta

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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