Oscar season is over, which means one thing: it’s on to the summer blockbusters. And one of the most anticipated summer movies is World War Z, starring Brad Pitt. The bestseller-turned-action-movie doesn’t come out until June 13, but people can’t wait. Jeff Costello, v-p of client services at CoverCake, a company that tracks trending topics on social media, said the online talk about the film is “off the charts right now” on Twitter, Facebook and other sites. This is evidenced in the book, by Max Brooks (Broadway Books), taking the top spot on this month’s chart—knocking off last month’s leader, American Sniper by Chris Kyle (Harper), which saw a boost after his murder.

One book to watch is Dan Brown’s Inferno, the forthcoming novel from the bestselling author, which, again, features globe-trotting symbologist Robert Langdon. Doubleday is releasing Inferno on May 14. While it’s no surprise that a new Dan Brown has people talking, Costello noted the unexpected run Agenda 21 has had on the list. (Last month the book, written by Glenn Beck and published by Threshold in November, ranked at #8 on the CoverCake list.) Costello said: “Normally, we would expect a political book like this to fade quickly after the launch month, but this book shows no sign of fading anytime soon.”

CoverCake’s Top 10 Books in Social Media, March 2013

Rank Title Author Scale* Male Female
1 World War Z Max Brooks 10 53% 47%
2 Catching Fire Suzanne Collins 7 39 61
3 Fifty Shades of Grey E.L. James 6 35 65
4 Inferno Dan Brown 5 47 53
5 Mockingjay Suzanne Collins 4 41 59
6 Agenda 21 Glenn Beck 3 52 48
7 Wave Sonali Deraniyagla 2 42 58
8 Sum it Up Pat Summit, Sally Jenkins 2 52 48
9 Lean In: Women, Work, and the Will to Lead Sheryl Sandberg 1 51 49
10 Gone Girl Gillian Flynn 1 48 52

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