To follow up on some things Phantom Screenwriter said:
Aside from the Facebook page, register a domain and set up a very simple website, or have the domain point to a blog for the film.
Get a cover photo up on that Facebook page! You are already posting, that is great. Invite every single person in your friend list to like the page.
Create a couple of press releases about making the film. You can send them to local news organizations or send them to filmmaking blogs.
Start setting up your Withoutabox profile for the film if you already haven't. Start making your festival strategy right now. Go through lists online, or research in Withoutabox to come up with the festivals you want to submit to and the dollar amount it will take to submit to all those festivals.
If you are going the festival route, remember to consider the costs. You can easily spend a couple of thousand dollars on even a modest festival strategy.
We did a successful Kickstarter for $3000.00 specifically for our festival costs. We had a nice festival run, and then, when the money ran out, that was it!
Best of luck!