Ask HN: Do you use Facebook to promote your business/project/venture?

The recent submission on Facebook[0] sparked some discussion, but mostly wrt the end user. Do you use Facebook:

1. As an consumer? 2. For your business/venture? (e.g. Facebook ads, promotions)

Has it been a successful channel for building your business? Do you feel an ethical dilemmas in using it?

[0]: https://news.ycombinator.com/item?id=15029960