Useful for anyone who’s ever had photos of their drunken escapades viewed by unwanted eyes, Privacy Defender ensures your Facebook privacy is exactly how you want it. With nifty, colourful graphs to illustrate restriction levels, users need only to enter their desired levels of privacy - and Privacy Defender does the rest.

LivingSocial
LivingSocial is an extremely popular deal-searching platform, and its Facebook app means finding great local deals is easier than ever. From restaurants to package holidays, there’s an range of real-time discounts on products and services for users to search through.

Zoho
Zoho is an online office space that lets users collaborate on projects in real time, and the Zoho Office Suite offers users a seamless link between their Zoho and Facebook accounts. Word processing, spreadsheets, presentations and databases are among the range of features, which can be stored afterwards  and shared with friends.

Trip Advisor - Cities I’ve Visited
Using an interactive map, the Trip Advisor application lets users plot places they’ve visited or intend to visit in the future. There’s certainly an element of “travel boasting” but the ability to share this information is useful for when friends are looking for advice on their own global voyages.

Jobster
Jobster connects users with company hirers to notify them about available jobs, while providing employees with users’ Facebook information. Integration is seamless, making the experience user friendly. It also lets Facebook users contact friends at selected companies to ask for career advice.

Feedburner
Especially good for business networking and marketing, this nifty app displays all of your Feedburner blogs, podcasts and RSS feeds on your Facebook page. It also lets you invite friends to view and subscribe to your feeds directly from their Facebook account

Runkeeper
If you want to bring a more social feel to your running, the tracking app shares all workout data to your Facebook friends including your current fitness status and whether you've actually been slouched on the sofa all day. Running aside, you can also track cycling, swimming, hiking and a whole host of other sports.