Commentary Facebook has a problem with America’s greatest president. Abraham Lincoln’s run-in with the tech giant began late last year, when Republic Book Publishers decided to buy social media ads for my new historical novel, “Old Abe.” The marketing team created and submitted ads to a handful of platforms. Right away, to our surprise, we hit a roadblock at Facebook, which sent a message saying: “Rejected—This ad doesn’t comply with our Advertising Policies.” Puzzled, we began jumping through hoops to fix the situation. We appealed the decision but got another rejection: “Following another review, this ad won’t run.” According to Facebook, the “Old Abe” ads violate a ban on advertising about “social issues, elections, or politics.” Facebook started the ban shortly before the 2020 presidential election and has left it in place for the time being. Our appeals exhausted, we threw in the towel. Facebook was determined to cancel Lincoln—at …