Twitter is a vital tool for connecting with your customers especially these days! When writing posts if you are linking to another page then make sure to use Bitly.com to shorten the url's to allow more characters for your posts.
Steve is quite right, posting interesting, interactive and relevant posts on a regular basis will most definitely help towards engaging new customers!
When talking about Facebook, there is a tool called Facebook/services. This is a platform Facebook created for businesses to advertise themselves making it easier for locals to find a company close by. We highly recommend that new businesses sign up and get the ball rolling!
I hope this helps!
Thanks,
Kim