Veronica Roth’s Divergent, the first book in her wildly popular series of the same name, was the most-talked-about title on social media in January. The number of conversations about the book grew steadily over the course of the month, as fans continue to anticipate the March 21 release of the film adaptation. The third and final book of the trilogy, Allegiant, published in October, was the second-most-discussed book of the month. Divergent and Allegiant landed at #2 and #5, respectively, on Nielsen BookScan’s bestseller list for the week ended January 26.

“A large percentage of the comments from fans of the [Divergent] series mentioned both books, which is not unusual for a popular series,” said Jeff Costello, v-p of CoverCake, which measures how books are faring on social media.

The big surprise of the month, according to Costello, was the appearance of Mary Shelley’s Frankenstein on the list. The nearly 200-year-old classic generated significant online commentary, thanks to the January 24 release of I, Frankenstein, a film based loosely on Shelley’s story. “Movies based on classic novels tend to drive a lot of conversation, and this movie was no exception,” Costello observed.

Lone Survivor, Marcus Luttrell and Patrick Robinson’s 2007 book about a Navy SEAL mission, landed at #4 on CoverCake’s chart. The book gained traction on social media thanks to the film adaptation of the same name, starring Mark Wahlberg, which has dominated the box office since its January 10 release.

Several new nonfiction titles joined the list this month, including David and Goliath, by Malcolm Galdwell, and Leaders Eat Last, by Simon Sinek. Published on January 28, La La Anthony’s The Love Playbook was #8 on CoverCake’s most recent chart. Anthony is the star of VH1’s La La’s Full Court Life, with husband and NBA star Carmelo Anthony; in the book, she shares her “rules for love, sex, and happiness.”

Rank Title Author BookScan* Scale** Male Female
1 Divergent Veronica Roth 2 10 44% 56%
2 Allegiant Veronica Roth 5 8 41 59
3 Catching Fire Suzanne Collins 98 7 39 61
4 Lone Survivor Marcus Luttrell 66 7 55 45
5 Frankenstein Mary Shelley N/A 5 53 47
6 David and Goliath Malcolm Gladwell 39 3 59 41
7 Lean In Sheryl Sandberg N/A 2 38 62
8 The Love Playbook La La Anthony N/A 1 43 57
9 Leaders Eat Last Simon Sinek N/A 1 53 47
10 The First Phone Call From Heaven Mitch Albom 34 1 40 60

* For the week ended January 26. If the book did not appear in the top 100 bestselling titles, the ranking is listed as not available.

** How many conversations took place about the book in question for every 10 comments about book #1