Hi, I would say that Facebook is good for B2C marketing but i found it less useful for B2B marketing, its been almost 4 months of advertising and more than $4000 spent and still only a few orders from it. i guess their mindset is more social and not business when surfing facebook.
I think you should hire an internet marketer with an exp in SMM who will build your whole strategy Putting your products on Facebook and bying Ads is not enough... there's a lot more behind it