NBC News reports having seen internal Facebook documents including one from an employee who contacted Apple's developer relations team. Apple was asked to remove the negative reviews, but refused.
There is no information about whether Google was similarly contacted. Neither company has spoken publicly about the issue.
The internal documents do discuss the reasons behind the protest.
"User trust is dropping considerably with the recent escalations between Israel and Palestine," one senior software engineer is said to have written on Facebook's internal message board. "Our users are upset with our handling of the situation."
"Facebook users are feeling that they are being censored, getting limited distribution, and ultimately silenced," he or she continued. "As a result, our users have started protesting by leaving 1 star reviews."