Political campaigns can “nano-target” voters with advertising to gauge their opinion on a specific issue and their likeliness to vote, The New York Times reports. For instance, in 2020, analytics firm PredictWise scored Republican voters using their cellphone location data to discern how much they stayed home during COVID-19 lockdown measures, which indicated they were a persuadable vote for Democrats. Researchers are concerned voter scoring increases polarization because it uses personal data for issues such as “gay marriage” or “non-Christian,” which people may generally consider private information.