Thank you for the question Ksenia_C! Yes we do. We actually in some sense have two approaches to user-generated metadata. Firstly, our metadata is created by people that share their OER in our service and those people are mostly not experts in metadata, so in a sense all of our metadata is user-generated. For these creators we have a guided path to adding the needed metadata with vocabularies from ePerusteet and other educational and multipurpose vocabularyservices.
In addition to this we are currently impelmenting a way for other users to add metadata to OER they find in the service. The idea is that sometimes the OER is suitable to an educational level or educational subject the creator did not understand that it might be suited for. Other users can then step in and tip the creator and other users that the resource is suitable also to other levels or subjects. We also encourage users to complement the original metadata in other ways, so that other relevant information about the resource can be shared (we hope that this will for example increase the amount of information on accessibility). Metadata generated by other users is seperated from the metadata generated by the original creator. Here you can find a picture on how user-generated metadata looks like / will look like in a weeks time. I cropped the image straight to the user-generated metadata, but to understand how it is positioned, the user-generated metadata and the reviews come after the OER files and creator-generated metadata.
I will gladly tell more of this, so if you have any more questions, do not hesitate to ask! 