On June 3, the California Secretary of State’s Office released a report showing a record 17,915,053 voters registered to vote in the California primary by the May 23 deadline.

As the highest total statewide voter registration ever, registrants represent 72.29 percent of Californian citizens eligible to vote. In the 45 days leading up to the primary, registration swelled — bringing a net statewide increase of 646,220 voters. California Secretary of State Alex Padilla credited this surge partially to social media.

“Facebook sent a reminder to all California users to register to vote. It is clear that Californians are engaged and excited about this election,” Padilla said in a statement.

Los Angeles and Alameda counties had the largest and second largest increases in registration since May 21, 2012, respectively. Los Angeles County registration grew by 450,636 people, while Alameda County registration grew by 81,472. Minor parties such as the Green Party and Libertarian Party saw a net decrease in registration across the state.