13. The method according to claim 12 , wherein said predictive model is built or updated through at least one machine learning algorithm applied to at least said second content metadata.
13. The method according to claim 12 , wherein said predictive model is built or updated through at least one machine learning algorithm applied to at least said second content metadata. 14. The method according to claim 13 , wherein said machine learning algorithm is applied also to at least some context metadata.