Acquia, a US-based open source software provider backed by publisher O’Reilly AlphaTech’s corporate venturing unit, has acquired Mollom, which manages spam on user-generated content pages, for an undisclosed amount.

Alongside O’Reilly AlphaTech Ventures (OATV) as Acquia backers have been venture capital firms North Bridge Venture Partners, Sigma Partners and Tenaya Capital, the company said.

Acquia raised $15m for its series D round in July last year from Northbridge, Sigma and Tenaya, which followed $8.5m in the C round in November…

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