This week Alan Daulby sits in for Adam Walton and hears about twitter.com, catches up with a new survey about online security and meets with Jones family as they help neighbours with a new computer.

Get Safe Online

The Government and commerically supported campaign encouraging internet safety Get Safe Online, recently produced a survey of internet users and their attitude towards web security. Tony Neate, managing director of Get Safe Online discusses some of the alarming statistics. Supporters of the campaign including eBay are offering advice for safe online shopping. There is also a new Safety Test which guides you through such nasties as viruses and phishing.

The next big thing?

The world moves at an ever increasing pace, particularly the online world, and predicting the next "big thing" is a tricky task. One of the contenders is Twitter, which simply asks visitors "what are you doing?". Bobbie Johnson of The Guardian, who is a self-confessed Twitterer, discusses this new way of taking a snapshot of online life.

Keeping up...

The Jones family make a return to mousemat this week - specifically dad Geraint, who puts his IT knowledge to good use and helps neighbours Tony and Pauline install and get to grips with their very first PC.

Problem Corner

Simon Zerafa pops into our Haverfordwest studio to answer some more problems.. Firstly from Mike who is using AVG anti-virus with Firewall and has noticed that the icon at the bottom of the screen has turned grey. He's worried that his PC isn't protected and what he should do... Simon says: When the icon turns grey it's just a quick visual indication that something needs your attention, such as updates - just right click and select updates. If that doesn't solve it - check in the AVG Control Centre and one of the areas may indicate where the problem lies. You can also check the AVG website. Regarding firewalls, only have one running at a time. By running the AVG Firewall, it should automatically disable the Windows built-in one.

Also Sarah asks about buying secondhand laptops and what are some things to look out for. In the case of the "1997" problem, it sounds like the internal battery has stopped working (this is used for keeping settings when it is switched off). This can be difficult to get replaced. Other issues with laptops, make sure it is switched off before moving it, to prevent wear to the hard drive. If you buy a secondhand laptop from a local retailer, check what sort of warranty is on offer, check the speed of the processor and amount of memory and the operating system. Also consider what software you will need to run and if a second-hand machine will suffice.

The BBC is not responsible for the content of external websites