A fact is a piece of content which has been published on a factline Community Server (FCS) platform. Each fact is provided with an infoID (a unique combination of numbers) which allows you to identify, retrieve and link (reference) facts. At the end of each fact, you can find its meta data.
A fact is stored centrally in the repository of the respective content service. Shortcuts allow you to structure facts thematically in folder in the service Structure.
Strictly speaking, folders are not facts because they do not have versions.