Opera just released the 10.5 beta version of its web browser for Mac computers — the fifth most popular browser on the market. We previously covered the Pre-Alpha version of 10.5 , but this beta release is likely far more stable.

This post originally appeared on the American Express OPEN Forum , where Mashable regularly contributes articles about leveraging social media and technology in small business. So your business is on Facebook, and brand engagement is up thanks to some savvy social media strategy