The media has played a significant part in this case. It was used to announce Madeleine's disappearance, to garner sympathy for the parents, to announce new initiatives in their campaign, and to damage the reputation of the PJ. This included accusing them of ineptitude, of leaking information and of ignoring leads.
I found this early 'leak' interesting, for example, because in my opinion that wasn't a Portuguese 'police source' speaking. Why? Because of the mention of how the McCanns felt about Jane's sighting and the criticism of the PJ officers who 'filed away' the description;
Timesonline
David Brown in Praia da Luz
May 27, 2007
A police source said that the friend who believes she saw Madeleine being carried away was in the group of three British couples and a single woman who had travelled with the McCanns to Portugal........
"She feels guilty that she was the last person to see Madeleine and didn't do anything, but there is no sense of hostility (from the McCanns)," said the police source. "They don't blame the woman, they feel sorry for her. But she feels guilty that she was the last person to see Madeleine."..........
"In the view of the parents this sighting was Madeleine was being taken," said the police source. "They have has put a timeline together which they have presented to police and believe this was Madeline. That is why they have never believed she had wandered off."..............
The police source admitted: "The officers who were first given the description just did not seem interested and they just seemed to have filed it away."
http://www.gerrymccannsblogs.co.uk/Nigel/id30.htm