This lecture will describe the ways to use various resources available through MyHeritage to find information about ancestors originating in Poland and to find relatives that still may live there. Zbigniew will focus on a unique resource: family trees uploaded by individual users from Poland. In most cases, they started a few years ago at the beginning of a big wave of popularity of family history research. The concern about privacy was not that strong yet so thousands of people uploaded their information and made it available through MyHeritage making it a unique source that is not available anywhere else. Learn the strategies for using this kind of information, its advantages, and possible traps.