Your boss is right to be cautious. Caution is prudent when your brand is on the line and with social, your perception sure is -- but that's true whether you jump in or not -- what's not certain is the strategy you use to get involved.
As Sagewing pointed out, doing social just to do it is reaching the point of absurdity and hopefully dying down. What you need is a program not for using one or two hyped up social tools but for taking the concept of social brand [a transparent company that encourages reviews, feedback and discussion] and find a way to make it work for the business. People will talk about you whether or not you participate so being involved isn't really an option, but at the same time, broadcasting out to social channels b2b or b2c isn't going to help. Find a reason to be in the mix, a value from it, or just sit back and monitor.
Hopefully your company has a good opinion of the end user and the value you provide too them which you can reflect in the social messaging to your business customers. If not, well, that's exactly what social media can help you with... it's not about direct sales, it's about perception leading to you being a trusted vendor so if you're fearful of what the people who ultimately make you money think about what you do, it's likely you already have the wrong perception out there.
Remember, when done right, lead generation is about helping consumers find the right business for a need, not simply hawking them off to the highest CPA buyer... that serves no one in the end.