1) OpenStreetMap is a project that aims to create and provide free geographic map data that anyone can use. Unlike other "free" maps, OpenStreetMap data has no legal or technical restrictions on its use.
2) OpenStreetMap data is owned by its contributors rather than a single company. Anyone can contribute to mapping and the data is made available under an open license.
3) The presentation encourages participation in OpenStreetMap by mapping one's local neighborhood, attending mapping parties, using online and offline editors, and getting involved in the OpenStreetMap community.