Open up an fb account, create a page and promote the page. You
need to spend a bit, depending on how fast you want people to know
your stuff. I did it, after 4 months and a few thousands, I got the
sales volume I had targeted.
Good thing about FB, it crawls to FB owners. They may not want
your product at the time your ad flashed on them but they may
"LIKE", share your page to their friends if they find your product
or service useful
Dont expect instant results. Build the customer base and
gain their trust. Wish u all the best