Search engine optimization software firm SEOmoz (Moz) has acquired Twitter analytics company Followerwonk for an undisclosed sum. The acquisition follows Moz’s recent closure of an $18m investment funding round.

Moz makes software for SEO and social media management, while combing web sites to find errors or missed opportunities, and then making recommendations based on best practices. The firm says the acquisition will enable it to expand Followerwonk's capabilities, which currently include Twitter profile searches, user comparison and graphical analysis.

Followerwonk was formed in 2009 after founder and SEO app developer Peter Bray noticed that Twitter was generating increasing traffic for his clients. His team develops software that enables people to search for Twitter users by bio, as well as the ability to sort by follower count, search within social graphs, and overlay relationships between users in a side-by-side comparison format.

Bray (pictured) comments: ‘Moz has really embraced our ideas and given us space to expand our product. It just seemed like the perfect place to integrate our technology. I think together we're on the path to do some really great things.’

Web sites: www.seomoz.org and www.followerwonk.com .

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