Facebook users now have more control over their privacy as you can now base privacy settings on groups of friends.

This uses the recently-introduced “Friends Lists”, which lets you classify your friends into groups – something which naturally appeals to a library type like me. So you can have a group for university friends, for school friends, for work colleagues, or for those people you don’t really know but you didn’t want to turn down when they asked to be your friend.

You can choose for any given type of information (e.g., your Facebook wall) to specifically allow or excluse a group of friends, an addition to more general settings controlling what’s visible to all of your friends and what’s visible to your networks.

So, for example, you might not want work colleagues to be able to see your status or photos of you behaving drunkenly at university (or last night for that matter). But you might be happy to give them access to your wall, which you don’t want to let your mum see. The new privacy settings are sufficiently granular that you can exclude a whole friends list from seeing photos tagged of you, but exclude just one friend (e.g., your mum) from viewing your wall.

The new system succeeds the all-or-nothing approach of “limited” profiles – and anyone who you’d previously set to limited will now be on a “Limited Profile” friends list. The changes also include a “Friends of friends” concept in case you want to make some information available to that group.

Today is Brian’s Facebook Friday, during which supporters of Brian Paddick, the Liberal Democrats’ candidate for Mayor of London, are being asked to sign up as fans on his Facebook page, and to encourage other Londoners on Facebook to do the same.

Signing up as a supporter is a good way of keeping in touch with Brian’s campaign and of publicly showing your support – it also gives you a tasteful little Brian Paddick icon on your Facebook profile. If you want to see Brian elected Mayor of London in May and you haven’t done so already, please register as a fan on Facebook now.

And, if you haven’t yet signed up for Facebook, it’s a great opportunity to do so!