FILE - This Oct. 21, 2015, file photo shows signage inside the YouTube Space LA offices in Los Angeles. YouTube’s inability to keep ads off unsavory videos is threatening to transform a rising star in Google’s digital family into a problem child. The key question is whether a recently launched ad boycott of YouTube turns out to be short-lived or the start of a long-term marketing shift away that undercuts Google’s growth, as well as Alphabet Inc., its corporate parent. (AP Photo/Danny Moloshok, File)

After the recent mass shooting in a Parkland, Florida, high school, videos spreading outlandish conspiracy theories began appearing on YouTube.Videos posited that the student victims of the shooting were hired…

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