Public Enemy frontman and former Air America host Chuck D retweeted that question yesterday, and today it seems he found his answer. As Twitchy noted, both Houston Rocket Dwight Howard and singer Rihanna tweeted #FreePalestine this week before deleting their posts.

Howard tweeted later that “he never commented on international politics and never will.” As for Rihanna, a source told TMZ that “she didn’t even realize it was a tweet until she started hearing from her fans.” According to the U.K. Independent, the source “went on to explain that the singer had been reading up on the Middle Eastern conflict online when she ‘clicked a link.'”

Chuck D has a different explanation: slavery.