Page One PR is based in San Francisco and implements social media campaigns for technology brands and start-ups. It currently boasts software clients including Cisco, McAfee, SAP and VMware.
News of the acquisition comes following the agency buying Belgium-based PR firm Leads United last year.
Lewis executive vice president Morgan McLintic said: 'Page One PR has a track record of delivering successful B2B social media campaigns for high profile brands. Those programmes demand creativity, discipline, deep technical knowledge and commercial acumen.'