By Jane Wakefield
Technology reporter

Publishedduration27 NovembershareSharenocloseShare pagelinkCopy linkAbout sharingRelated Topics

• Facebook-Cambridge Analytica scandal

image copyrightGetty Imagesimage captionTargeted advertising is common, but the same thing is happening in politics with far less clarity

How much do political parties know about you – and how is it used to try to sway your vote?

The Cambridge Analytica scandal threw light on how the Facebook data of millions was harvested and turned into a messaging tool.

The revelations were criticised far and wide by politicians of all stripes.

But now, a report from the UK's Information Commissioner's Office (ICO) puts the spotlight on the relationship between data brokers and the politicians here.