From Mobile contribution research
References
Return the reference / citations list so that curating users can easily review these external links, also potentially useful for some reading focused features
Tagging
Allow users to tag a page/section as needing: general cleanup, copyediting, tone adjustment, structure changes, content removed, more context, expansion, clarity, more balance, more referencing, better categories
User to user communication
Thank a user for their contribution and manually welcome a user