Michael Pollitt | freelance technology journalist

Do you trust caller ID? You might have good reason not to after reading my latest piece – Who’s really on the phone? – in today’s technology Guardian section.  Is 01789 0000000 somebody in Stratford-upon-Avon or a cold-calling American holiday company?

My story in technology Guardian today – How to get online advertising for free – looks at some popular badges, quizzes, and widgets for your blog or website. They do more than you expect.

And my piece has since prompted some reader responses.