It is possible to pull in traffic without social media. Many readers "Hub Hop" on this site and will find your hubs. They are likely to share hubs they really enjoy on Facebook and Twitter. You can also blog about your hubs to pull in traffic, too.
I do have to say, it really does help to use social media though. You might want to consider having a Facebook account just so you can join Facebook groups devoted to HubPages. You can meet many other hubbers and help each other. I barely use Twitter, but I do have an account. I occasionally post my hubs on Twitter. I've found Facebook and Pinterest works better than Twitter though.