Freebase was launched to be a “Wikipedia for structured data”, because in 2007 there was no such project. But now we do have Wikidata, and Wikidata and its community is developing very fast. Today, the goals of Freebase might be better served by supporting Wikidata.
See https://plus.google.com/109936836907132434202/posts/bu3z2wVqcQc
Freebase has seen a huge amount of effort go into it since it went public in 2007. It makes a lot of sense to make the results of this work available to Wikidata. But knowing Wikidata and its community a bit, it is obvious that we can not and should not simply upload Freebase data to Wikidata: Wikidata would prefer the data to be referenced to external, primary sources.
The Primary Sources Tool is an Open Source tool which will run on Wikimedia labs and which will allow Wikidata contributors to find references for a statement and then upload the statement and the reference to Wikidata. We will release several sets of Freebase data ready for consumption by this tool under a CC0 license. This tool should also work for statements already in Wikidata without sufficient references, or for other datasets, like DBpedia and other machine extraction efforts, etc.
Website and discussion of this tool: https://www.wikidata.org/wiki/Wikidata:Primary_sources_tool