This is Guest post by James, who is a technology analyst and Facebook aficionado who works at an online store offering ink cartridges and franking machine ink to customers in industry throughout Great Britain.

As you no doubt realize, Facebook isn’t just for teenagers who want to chat online or swap pictures of their latest spring break vacation. Rather, Facebook has become a central tool for business to find customers and connect with them. How can you take full advantage of Facebook to grow your business? Check out the following must-have apps for your Facebook business account.

1. BillMonk

BillMonk helps you keep track of the money that people owe you, as well as money that you owe others. Closely following the Facebook design conventions, this app is great way to track your debts and invoices without having to learn complicated financial software.

2. Email

Facebook is great, but let’s face it: Not everyone you do business with has jumped on the bandwagon yet. Not to worry, though. Email nicely bridges the gap between Facebook users and non-Facebook users. Just install the app and instantly you can send e-mail messages to any e-mail address without leaving Facebook. The messages will seem as if they were sent from your regular e-mail address. Recipients even have the ability to reply online, thus keeping the message thread within the Facebook app.

3. My LinkedIn Profile

Many business contacts use LinkedIn to evaluate your experience and expertise. This app gives you a badge on Facebook that connects to your LinkedIn account.

4. To-Do

To-Do is an excellent app for keeping track of all the little tasks you need to perform. It will especially be helpful if you’re familiar with the GTD methodology (“Getting Things Done”), but even if you’re not, it’s a very handy app to have around. Features include setting task categories, priorities, and due dates.

5. Testimonials

Testimonials is a great app for gathering all of your references—whether professional or academic—into one place for easy retrieval.

6. Simple Stock Quotes

This nifty little app helps you keep up with what’s happening on Wall Street. Not only is it easy to set up and use, but it even gives you the ability to see what stocks your contacts—and the entire community—are tracking.

7. Polls

A great tool for keeping your finger on the pulse of your customer base, this app lets you easily create polls and analyze the results.

8. Calendar

This calendar app, available from 30Boxes, provides one of the simplest, most easy-to-use calendars there are on Facebook. It includes a to-do list as well as the ability to send yourself reminders via text message (SMS). There’s also a built-in function for publishing calendar events on your Facebook profile.

9. Calliflower

Calliflower provides an easy way to plan and make free conference calls, and follow-up on them afterwards. This is an excellent app for those who need to connect across various business and social networks.

10. Twitter

Our top-ten list would be remiss if it didn’t include Twitter! Much like Facebook, Twitter has quickly become a main-stream tool for business and personal use. The Twitter app lets you follow your contacts and even update your status right there on Facebook.

Undoubtedly, Facebook will continue to play a central role in helping business find—and keep—customers. If you haven’t yet evaluated these apps, do so now! There’s no better time to get started.