What is spam?

Background

As part of our spam handling strategy we need to have a clear definition of spam. In particular, do we consider advertising as spam. For example https://slidewiki.org/deck/95212-1/slide/589889-1/589889-1:9/view includes information about repairing a laptop and then the last slide advertises a phone number that could be a fraudulent number. Our terms and conditions should make it clear what content is acceptable so we need to decide if we exclude advertising from SlideWiki.

Comments:

• If someone for example prepares a lecture over healthy food and at the last slide gives his contacts e.g. for questions - what do we say? It is of course an advert, but..do we allow it or not
• Or maybe we might in such situations let our users decide? I mean that users can also mark a deck not only as a spam. but as an advertising..
• We could say: max 10% of slides are advertising - at least 50% needs to be educational

Looking at wikimedia foundation as a model ... https://wikimediafoundation.org/wiki/Terms_of_Use/en there terms of use prohibit offensive material. There is also guidelines on spam https://en.wikipedia.org/wiki/Wikipedia:Spam

At the moment our "Imprint page" states: 

Licensing Your Content: You retain any copyright that you may have in Your Content. You hereby agree that Your Content: (a) is hereby licensed under the Creative Commons Attribution 4.0 License and may be used under the terms of that license or any later version of a Creative Commons Attribution License, or (b) is in the public domain (such as Content that is not copyrightable or Content you make available under CC0), or © if not owned by you, (i) is available under a Creative Commons Attribution 4.0 License or (ii) is a media file that is available under any Creative Commons license

Previous SW 1 terms of use stated:

Action items