Social media can influence political behavior through social networks. Researchers sent social or informational messages to over 60 million Facebook users before the 2010 US elections. Those who received social messages were more likely to click "I Voted" or seek polling places. Examining voting records found those who received social messages were slightly more likely to vote. Effects increased with stronger social ties - close friends had a greater influence than distant acquaintances. The study provides evidence that online political mobilization through social networks can translate into real-world voting behavior changes.