Pixelpark Germany (http://www.publicis.com/capabilities/) started 1991 and scaled to 500 full-time employees around 2009. Currently claims 800 (not sure how many full-time). They even IPO-ed. No product on their own, it's still doing web-solutions for customers only. It just covers full brand management, research, SEO/SEM etc as well now.
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Pixelpark Germany (http://www.publicis.com/capabilities/) started 1991 and scaled to 500 full-time employees around 2009. Currently claims 800 (not sure how many full-time). They even IPO-ed. No product on their own, it's still doing web-solutions for customers only. It just covers full brand management, research, SEO/SEM etc as well now.