Key TakeawaysSnap missed revenue estimates for the second quarter and offered lower-than-expected guidance on advertising weakness.The operator of the Snapchat social media site said it is taking steps to improve its advertising platform.Shares of Snap lost nearly one-quarter of their value in early trading Friday following the news. Shares of Snap (SNAP) plunged nearly 25% in early trading Friday after the social media company missed revenue estimates for the second quarter and offered lower-than-expected ...