The importance of reader’s content (images, video clips, stories) is rapidly increasing in journalism as the source of news and as news content. Our research focuses on cooperative newsmaking with the readers. The activity is facilitated by a news organization, currently Metro in the metropolitan Helsinki area in Finland. In 2012, the studied newsroom received 35 000 reader’s photos sent by 30 000 individuals. Majority of the 4000 stories published in 2012 were based on reader’s photos that were used as tip-offs for news in the newsroom. Since 2010 we have studied both reader initiated contributions and carried out field studies with mobile task-based cooperation in which newsroom creates the tasks. We have addressed the following themes: 1) What motivates readers to participate? 2) What influences their participation when using mobile tasks? 3) How to manage the content quality with social feedback? I will address in this talk the main findings from our studies.