In all seriousness, "business" is a very generic term, so you might need a little more in that; you could be looking for the Wall Street Journal or you could be looking for Paul Graham's Essays.
There aren't any other social news sites (to my knowledge) predicated on upvotes/downvotes, but here are some of my favorite sources for non-technical people the tech industry (which I assume you would be most interested in because you're on HN).
http://PandoDaily.com - covers the Silicon Valley scene in general, each writer has his or her own perspective and is usually very opinionated. The PandoMonthly videos are among the best content on the web. Period.
Fred Wilson's Blog - http://avc.com covers a lot of the venture capital world for tech startups. Some fascinating stuff in there.
Mark Suster's blog is usually pretty great http://www.bothsidesofthetable.com/
Venture Beat has some good stuff at times http://venturebeat.com/
Obligatory TechCrunch (I'll assume you've heard of it, if not, it is definitely the place with the most traffic) http://techcrunch.com
There's Wired (http://wired.com)
All Things D (http://allthingsd.com)
The Verge (http://theverge.com)
Robert Scoble's Blog (http://http://scobleizer.com/)
And a ton more.
Hacker News is really the best business-of-software site. http://inbound.org/ is essentially Hacker News for SEO/internet marketing.
For market news, it depends on what you want, but http://caps.fool.com/ is good coverage and socially-driven. Unlike HN, it has built-in features to show if a user's predictions about the future tend to be correct (only really possible in the stock world.)
The best general research and analysis sites are, in my opinion, still the curated/paid ones with on-staff researchers. I greatly miss my Roubini Global Economics subscription. I think, though, that someone could really cut down businesses like those with the right kind of site.
It was even based on the HN/Arc code.