Check out my answer to a similar question: Best Way to Market Online Company
I'm not sure why you would list your Facebook fan page on the front page of your website when it is completely unused. Frankly, it's probably hurting you much more than helping because it makes your business look abandoned. Likewise, your Twitter account is a series of "look at me" posts that nobody is going to take seriously. I would make an active, serious effort to get engaged in social media or get rid of it altogether.
I would strongly suggest starting a blog on the subject of time management tips. Create and share content with your audience and you will begin to attract more fans (and customers). Create an email newsletter on the same subject and begin creating an email database.
From a messaging standpoint, I would suggest that you focus a little more on the problem(s) you're solving and a little less on the features. For example, the headline on your front page is "The Easy and Affordable SMS Reminder Service." I think it would be more effective to replace that with the last sentence in that first section; "Save time and money. Reduce no-shows."
One other observation that seems pedantic, but really makes a difference to your conversions: Fix all of the grammar and punctuation mistakes. You're repeatedly using possessive cases instead of plural (e.g. "Credit's never expire"). This severely reduces your credibility.
