Facebook Inc.’s Instagram played a much bigger role in Russia’s manipulation of U.S. voters than the company has previously discussed, and will be a key Russian tool in the 2020 elections, according to a report commissioned by the Senate Intelligence Committee.

The Russian Internet Research Agency, the troll farm that has sought to divide Americans with misinformation and meme content around the 2016 election, received more engagement on Instagram than it did on any other social media platform, including Facebook, according to a joint report by three groups of researchers.