  Social media are utilized by millions of citizens to discuss important
political issues. Politicians use these platforms to connect with the public
and broadcast policy positions. Therefore, data from social media has enabled
many studies of political discussion. While most analyses are limited to data
from individual platforms, people are embedded in a larger information
ecosystem spanning multiple social networks. Here we describe and provide
access to the Indiana University 2022 U.S. Midterms Multi-Platform Social Media
Dataset (MEIU22), a collection of social media posts from Twitter, Facebook,
Instagram, Reddit, and 4chan. MEIU22 links to posts about the midterm elections
based on a comprehensive list of keywords and tracks the social media accounts
of 1,011 candidates from October 1 to December 25, 2022. We also publish the
source code of our pipeline to enable similar multi-platform research projects.
