How do you find facebook as a marketing channel?

Never tried before. But think there should be a way for it to work

some says social media is a one way to make a good marketing and sales...

It is very effective but also time consuming because if you really want to get the word out about your business you're going to have to make about 50 feeder accounts and add friends every day using software. This way your fan page goes viral, one thing though you might get a C&D in the mail, I know all about hem and they aren't nice or considerate. Doing it the slow and legal way is possible too but does not have as much effect as the method above.