FTW, I think it is more efficient to promote work-related topics through social networks that are actually populated. So a fan page on Facebook or Twitter account would be more useful than G+. I know that there have been a lot of articles recently about how G+ has so many active users, but Google is fudging the math. They count anyone with a Gmail adress as an active user. And many people have 2-3 gmail accounts for work, personal use and additional security or overflow. Anyway, I think G+ is pretty much only used by the tech crowd and social power users. Although, I'm a social media professional and I don't even use it.