Again, this is a post that looks at content curation as part of an external marketing mix but it has some useful and relevant info that we can also use.
The author quotes some research that breaks companies into three groups according to how much curated and how much created content they share:
-Curators = Companies that link to third-party sites 75% or more of the time.
-Balanced = Companies that link to third-party sites 50-75% of the time.
-Self-Promoters = Companies that link to their own content 50% or more of the time.
Balanced companies , the ones that mix in 25-50% of their own content with 50-75% of high quality curated materials seem to do best at driving conversation and engagement.
I haven't seen any similar research for internal comms and I would expect that employees would prefer to see a higher amount of internally created content ( say closer to the 50% margin) but without data , that's just a guess so far.