During the workshop participants will develop a series of programmes on climate change and evaluating their relevance based on the content and the technical production.
On Tuesday, defence counsel William Taylor QC revealed the content of material which was originally blanked out in order to illustrate its relevance to the trial.
This scheme has advantages for users (the chance of more content that is more relevant) and for advertisers (actual demonstration of relevance of lookalike audiences) but it raises concerns as well.