On today’s show, we’ll talk about a new report from ProPublica indicating that Facebook allows buyers to target their advertising toward, or exclude, certain racial groups; the expansion of a startup called Hollar, which is aiming to be the online version of your dollar store; and Google’s announcement about a key vulnerability in Windows’ operating system software.

On today’s show, we’ll talk about a new report from ProPublica indicating that Facebook allows buyers to target their advertising toward, or exclude, certain racial groups; the expansion of a startup called Hollar, which is aiming to be the online version of your dollar store; and Google’s announcement about a key vulnerability in Windows’ operating system software.