They say all politics is local, and targeted advertising makes it hyper-local. Campaigns have increasingly used troves of personal online data about voters to narrowly tailor political messages — sometimes in malicious ways. For example, providing false information about how to vote based on neighborhood, race or ethnicity. But this kind of microtargeting is getting trickier. Twitter and TikTok have banned political ads completely. And Facebook has added new limits on how and when political ads appear. Marketplace’s Meghan McCarty Carino speaks with Samantha Lai, a research analyst at the Center for Technology Innovation at the Brookings Institution. Lai says the way social media platforms allow campaigns to microtarget users has evolved.