Former President Obama posted a series of tweets Friday sharing positive news stories from 2017 he said "remind us what’s best about America” and encouraging followers to “keep changing the world in 2018.”

“As we count down to the new year, we get to reflect and prepare for what’s ahead,” Obama wrote. “For all the bad news that seemed to dominate our collective consciousness, there are countless stories from this year that remind us what's best about America.”

The former president shared several news stories from 2017, including a couple postponing their wedding to volunteer in recovery efforts following Hurricane Harvey, NFL player Chris Long donating his entire 2017 salary to various charitable causes and a 10-year-old in Chicago launching a massive campaign to help the homeless.

Kat Creech, a wedding planner in Houston, turned a postponed wedding into a volunteer opportunity for Hurricane Harvey victims. Thirty wedding guests became an organization of hundreds of volunteers. That’s a story from 2017. https://t.co/yxhjwkr5Se — Barack Obama (@BarackObama) December 29, 2017

Chris Long gave his paychecks from the first six games of the NFL season to fund scholarships in Charlottesville, VA. He wanted to do more, so he decided to give away an entire season’s salary. That’s a story from 2017. https://t.co/NL0RoARkan — Barack Obama (@BarackObama) December 29, 2017

Ten-year-old Jahkil Jackson is on a mission to help homeless people in Chicago. He created kits full of socks, toiletries, and food for those in need. Just this week, Jahkil reached his goal to give away 5,000 “blessing bags.” That’s a story from 2017. https://t.co/muxPZnEGkd — Barack Obama (@BarackObama) December 29, 2017

Obama ended the series of tweets by encouraging followers to “keep changing the world in 2018.”

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“All across America people chose to get involved, get engaged and stand up. Each of us can make a difference, and all of us ought to try,” Obama said.

All across America people chose to get involved, get engaged and stand up. Each of us can make a difference, and all of us ought to try. So go keep changing the world in 2018. — Barack Obama (@BarackObama) December 29, 2017

Obama spent the Christmas holiday in Hawaii, where he surprised Christmas carolers who were singing outside the estate where he and his family were staying.

A new survey released by Gallup on Wednesday found that Obama is America’s “most admired man” for the 10th consecutive year.