Hoi, Wikidata is a reflection of all the Wikimedia projects, particularly the Wikipedias. Both Wikidata and Wikipedia are secondary sources and when two Wikipedias have opposing information on singular information, it is a cop out to state both "opinions" on Wikidata and leave it at that.
Given that Wikidata largely reflects what a Wikipedia indicates, it is important to curate such differences. The first thing to consider is are we interested at all in knowing about "false facts" and then how we can indicate differences to our editing and reading community.
I have been editing about Africa for a long time now and I find that the content about Africa is woefully underdeveloped. Best Wikipedia practice has it that cities and villages are linked to "administrative territorial entities" like provinces and districts and I have added such relations from primary to secondary entities. Adding such information to villages and cities as well is too much for me. The basic principle is that I am being bold in doing so. I do relate to existing items and I have curated a lot of crap data so far. The result is that Wikidata in places differs considerably from Wikipedias, particularly the English Wikipedia.
As topics like the ones about Africa are severely underdeveloped, just adding new data is a 100% improvement even when arguably adding sources is a good thing. By being bold, by starting from a Wikipedia as a base line, it is important to note that not adding sources is established practice in Wikidata.
The issue I raise is that when "another" Wikipedia considers its information superior, it is all too easy to make accusations of adding "fake facts" particularly when it is not obvious that the "other" Wikipedia provides better information. To counter such insular behaviour, it becomes relevant to consider how we can indicate discrepancies between stated facts in any Wikimedia project vis a vis Wikidata. Obviously it would be wonderful when the total of all our projects are considered in a visualisation.
Particularly when a subject is of little interest to our current editor community, the data in the Wikipedias and by inference in Wikidata is weak. Many of the subjects, Africa just as one example, are relevant to a public, both a reading and editing public, that we want to develop. Without tools that help us curate our differences we will rely on insular opinions and every project is only a part of what we aim to achieve in all our projects. We will have a hard time growing our audience.
NB this is an old, old issue and it is not going away. Thanks, GerardM
https://ultimategerardm.blogspot.com/2016/01/wikipedia-lowest-hanging-fruit-...