CNN — Seattle’s public school system on Friday filed a lawsuit against several Big Tech companies alleging their platforms have a negative impact on students’ mental health and claiming that has impeded the ability of its schools “to fulfill its educational mission.” The lawsuit was filed against the parent companies of some of the most popular social media platforms, including Facebook, Instagram, TikTok, Snapchat and YouTube. The school district, which is the largest in the state of Washington with nearly 50,000 students, alleges in the suit that the companies “have successfully exploited the vulnerable brains of youth” to maximize how…