The website, which uses techniques employed in gaming, has now raised at least $12.5m.
Bunchball, a US on-line company backed by the corporate venturing unit of information technology company Adobe, has raised $6.5m.
Adobe Ventures-backed Bunchball raised the money from venture capital firms Triangle Peak Partners, Northport Investments, Correlation Ventures and previous investor Granite Ventures. It is unclear if Adobe committed to the latest round.
Bunchball, founded in 2005, uses techniques employed in software games to enhance websites and mobile applications in an effort to increase user loyalty and revenue. It has previously raised…