Well over half of Facebook's users are aged 25-plus. So now you’ve signed up, learnt the spotty kid from school is a venture capitalist and spent hours retouching your holiday photos to put online, it’s time to pimp your profile. In May, Facebook threw open the doors of its system, inviting programmers and hackers to build applications that run inside Facebook and let you do interesting and (mainly) pointless things.

NB: The following links will only work if you have a Facebook account and you're logged in. Log in, see what your mates are up to, then come back and click on the links...

1. Top Friends: Turns the happy, friendly world of Facebook into a ruthless popularity contest. You pick your 32 best friends, rank them, and receive a ranking of your own popularity. It’s deeply unpleasant.

2. Graffiti: Adds a simple little drawing program (a bit like MS Paint) to your profile, so friends can drop by and doodle. What's amazed me is the quality of art that's appeared on my profile. Some people really have too much time.

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3. Video: Unique among add-ons in that it’s useful and was developed by Facebook. Rather than using YouTube, or e-mailing videos to friends, you can upload them on to your Facebook profile so your mates can all watch little Portia singing the theme to Wonder Pets!.

4. Zoho: Why not do some actual work? Many people abandon all pretence of work once they join Facebook. With Zoho, you can now work inside Facebook, logging into Zoho and writing documents or creating presentations online. Take that, boss.

5. Zombies: This is where you start asking: “Why?” Sign up to Zombies and you can bite your friends, making them zombies. Bite loads of them, you’re a “Zombie Ninja”. If you don’t, you’re a “Zombie Newbie”. That’s it, really. It's such a success that the developers created a follow up: "From the makers of Zombies comes Vampires! Kind of like Zombies. Except that the vampires are hot." There's also Pirates vs Ninjas, which sounds like more fun than one man can bear.

6. Bored by the book: If you find that Facebook is absorbing 60 per cent of your working day, sites such as Bored by the Book can fill that last 40 per cent. Turn your profile picture into multicoloured little letters! Draw an animated 3-D graph of your friends! Is there any way I can get paid to do this full-time?

7. Bottom 5: Is the even more evil twin of 'Top Friends'. Drag and drop five of your previously top friends into your bottom friends, and display them in your profile.

8. Pacman: It's Pacman! In Facebook! It doesn't get any better than this.

9. Vibrating Hamster: Oh, hang on. Life does get better. It's a hamster (you can choose one from a selection) which lives on your profile page. If you click it, it vibrates and sings.

10. Rock Paper Scissors: Challenge your friends to a game of Rock Paper Scissors. It's pretty hard to play over the phone, so this could be a winner... You can challenge me to a game by clicking here.

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