Facebook has added a new real-time commenting feature to all users. Now all Facebook members can see live comments from their friends without need to reload the page.

"Live commenting, which we rolled out to all of our users a couple weeks ago, creates opportunities for spontaneous online conversations to take place in real time, leading to serendipitous connections that may not have ever happened otherwise," writes Facebook's Ken Deeter in a Monday blog post.

While Facebook hopes that the new feature will keep users to spend more time on the site, it is dubious. Meantime, it took a hard time for Facebook developers to enable live commenting as they had to develop a new "push-based design" to get the feature to work on such a massive scale.

"This wasn't a small challenge: every minute, we serve over 100 million pieces of content that may receive comments," Deeter writes. "In that same minute, users submit around 650,000 comments that need to get routed to the correct viewers. To make this feature work, we needed to invent new systems to handle load patterns that we had never dealt with before."