Ashley Jost and her friends had just made a pledge to read more books. The 27-year-old bought the book, Girl, Stop Apologizing," and began reading it when she got home. There was a surprise waiting for her inside. Five dollars fell out on the floor. She knew the cash wasn't hers because she doesn't carry any, she said. When the college administrator started thumbing through the pages, she found a neon pink Post-it note stuck inside with a handwritten message. The note read: "I was having a tough day. I thought maybe I could brighten someone else's with this little surprise. Go buy a coffee, a donut or a face mask. Practice some self-care today. Remember that you are loved. You are amazing. You are strong. Love, Lisa." Jost was deeply moved. She felt obligated to share the note. So she took a picture and posted it on her Twitter account. "It sort of caught fire," she said. A few of her friends shared it - and the local paper picked it up. Even the book's author, Rachel Hollis, encouraged her followers to pay it forward in their own ways. Jost's tweet has been liked more than 3,000 times and shared around the world after the BBC got wind of the story. People are pledging their own random acts of kindness -- including her. Once a day for a week, Jost hid surprise love notes and "lots of Starbucks gift cards" totaling five dollars a day in coffee shops, restaurants and libraries. Jost says she plans to do at least one kind thing every week from now on.