Heya folks :)
Data in Wikidata needs to be reliable. At the same time the project needs to be as open as possible to achieve its goal. We already have a few ideas but I am sure so do you. I started a page for brainstorming about measures we can take to discourage unwanted edits (or making it easy to spot them) while at the same time not giving up on the openness of the project. Please add your ideas to http://meta.wikimedia.org/wiki/Wikidata/Preventing_unwanted_edits
Cheers Lydia