Well OP, i suggest you to take it easy since there is no worst thing in ppc than jumping around from one network to the other trying to make it work, Try to learn the details on one network and solve the question, why it does not work?
It all comes down to have enough budget to test, find a way to get even with spend/conversions and scale it up, trying to find the most relevant and targeted traffic possible.
Bing is a good network and IMHO and safer than facebook and google, among a lot more depending on the traffic you are looking for.
Everything can make the difference in ppc to make a campaign work or to spoil it up if you make changes and test.
check out spyfu, whatrunswhere and similar services to check out where your competition is working, it might help.