A GOP legislative effort to prevent Virginia children from using the popular video-sharing app TikTok — an idea backed by Republican Gov. Glenn Youngkin — died this week in the Democratic-controlled Legislature. The bill, sponsored by Republican Del. Jay Leftwich of Chesapeake, was left in a House of Delegates committee after concerns were raised about how the ban would be enforced. Lawmakers also questioned whether singling out just one company was the right approach at a time of broad and rising concern from parents and lawmakers about the effect of social media on youth.