Executives from Alphabet Inc. /zigman2/quotes/202490156/composite GOOGL -2.69% /zigman2/quotes/205453964/composite GOOG -2.67% parent Google's YouTube, Snap Inc. /zigman2/quotes/205087158/composite SNAP +0.20% , and TikTok are scheduled to testify Oct. 26 for the next Senate panel inquisition on social media's impact on kids. Facebook Inc. /zigman2/quotes/205064656/composite FB -2.33% faced a similar reckoning late last month. Next week's hearing will be held by Sens. Richard Blumenthal, D-Conn., and Marsha Blackburn, R-Tenn., who chastised Facebook for knowingly allowing policies on Instagram that are harmful to teens following a blockbuster report in the Wall Street Journal. In a subsequent statement Wednesday, Blumenthal demanded that Facebook Chief Executive Mark Zuckerberg and Instagram head Adam Mosseri testify next week.