Whistleblowers and online whistleblowing platforms have received quite a bit of attention recently. Discussions range from the feasibility of implementing a sufficiently secure platform online for whistleblowers, to the changing role of journalism, to the ethics of whistleblowing itself. The lessons learned from implementing multiple whistleblowing platforms in various contexts will be presented here. The main experience is from Publeaks, a Dutch whistleblowing system based on the GlobaLeaks platform, launched in September of 2013. (Publeaks now has almost all of the national press on board.) The development of other leaking sites - like Wildleaks in Africa - will be discussed. Globaleaks and SecureDrop will be introduced and compared. The panel will reflect on social and legal challenges that your group might be facing if you try to implement a whistleblowing platform. You will get some practical and theoretical insight into how you can create your own platform, whether for internal whistleblowing in an organization or for broad multi-stakeholder installations like Publeaks.