This question was discussed in the Facebook group Duolingo Esperanto Learners.

https://www.facebook.com/groups/duolingo.esperanto.learners/permalink/550406195121402/

There was some disagreement among the fluent speakers about how far the word dividi could be pushed without being considered an anglicism.

There are certainly many examples of dividi being used with thoughts, experience, expertise, and objects that are not chopped up and parted out. Based on examples found in the Tekstaro, dividi can be used with fate, thoughts, remarks, danger, happiness, and opinions

As for "sharing" things on Facebook, the term diskonigi is in use - possibly due to Richard Delemore's use of the term in his Evildea videos. Note that different social media use different expressions for this action. Certainly dividi and reafiŝi could also work.