Yes, and the percentage is probably a lot higher. Vice reporters contacted every school that has been targeted in Libs of TikTok tweets. Only a small percentage of schools responded. At least one school that responded by saying they had not received bomb threats actually had - according to local media reports I reviewed while preparing a story. It's possible administrators misunderstood or misinterpreted the question.

But in any case, 25% is probably far lower than the actual percentage.