Yelp temporarily disabled new reviewers from posting comments until it probes a spike of “unusual reviews” at the Pennsylvania McDonald’s where Donald Trump worked the fry baskets and drive-through window. The “unusual activity alert” was issued days after the former president held a photo-op at the fast food restaurant in Feasterville, closing down normal operations for hours, and prompting a flood of Yelp reviews which, as NBC News reported, “varied in content, jest and vulgarity, with some criticizing the franchise owner for hosting the Trump campaign.” “Customer service was a joke. Senile …