Table 1.

Qualitative codebook and sample messages for Research Question 1.

Domain	Description	Sample messagesa
Cancer risk	Messages are related to HPVb and relationship to cancer and HPV vaccine. This includes concerns related to cancer and awareness of cancer risk. Comments can be any related type of cancer: cervical, throat, penile, and anal.	“it's not just genital warts, the hpv vaccine can prevent cervical cancer.”; “the vaccines don't prevent all causes of cervical cancer, they protect against some strains of hpv which can cause cervical cancer. also, they only started giving that vaccine to women over 25 recently.”
General sexual behavior	Messages are related to HPV and sexual activity including discussions of age of sexual debut, risky sexual behavior, multiple sex partners, and associations with promiscuity. Messages need an explicit connection to HPV. Can include screening behavior if it is related to sexual activity.	“I've only had one sexual partner in my history and we were both virgins, so i'm certain i'm clear. not that hpv is a death sentence or anything, but i'd rather not have to deal with it . ”

^aMessages have been lightly edited to protect user anonymity.

^bHPV: human papillomavirus.