Yes, but there are some ifs.
1. If Facebook isn't blocked in your country.
2. If you have got a popular Facebook page.
There are many websites with millions of active users, but these users are not necessarily knowing that you exist even you're one of them (an active member in the certain popular website).
From a SEOer's point of view the best traffic is the one that's coming from the SEs (search engines). Another very good one is the direct traffic, but still, before it becomes a direct one, it's probably coming from an indirect source (like the mentioned SEs, social networks... and forums, blogs, etc.)