Half of adults age 18-24 in the United States who own smartphones have installed the Snapchat app, according to recent data from comScore.

That's a significant increase in usage compared with the same time last year, when just 30% of 18-24-year-olds were using Snapchat.

Use of the mobile messaging app has also spiked with older Millennials, age 25-34, with 20% now using it—up from around 8% last year.

Usage among non-Millennials, adults age 35+, has not increased at the same rate, remaining under 10% for the past year.

Snapchat's combined penetration for both Millennial segments (18-24 years old and 25-34 years old) is now at 32.9%, making it one of the most used social apps with the age group, the analysis found.

Only Facebook (75.6% penetration) and Instagram (43.1%) have more Millennial smartphone users than Snapchat.

The rest of the major social apps now all have fewer Millennial users than Snapchat, including Twitter (23.8%), Pinterest (17.9%), Google+ (18%), Vine (10.7%), and Tumblr (6.3%).

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image of Ayaz Nanji

Ayaz Nanji is a digital strategist and a co-founder of ICW Media, a marketing agency specializing in content and social media services for tech firms. He is also a research writer for MarketingProfs. He has worked for Google/YouTube, the Travel Channel, AOL, and the New York Times.

LinkedIn: Ayaz Nanji

Twitter: @ayaznanji