Table 3.

Latent Dirichlet allocation topic modeling for all Facebook comments, showing topic keywords and weights, topic interpretation, and example comments (N=51,835).

Topic number	Topic name	Top 10 keywords and weightsa	Interpretation by authors	Example of Facebook comments (paraphrased)
1	Sharing personal experiences	0.013*go 0.011*heart 0.010*time 0.010*like 0.009*think 0.009*tell 0.009*doctor 0.009*know 0.009*pain 0.009*get	People shared personal stories related to heart disease, physicians, and insurance.	The cardiologist never explained what was going on, and the ER doctors also never said except they needed more tests to make money from you. [I] am afflicted with cardiomyopathy and afib, making my hands and feet cold from poor circulation.
2	Survivor stories	0.065*heart 0.031*years 0.026*surgery 0.022*valve 0.017*ago 0.017*old 0.016*attack 0.014*year 0.013*open 0.012*dr	Survivors shared personal experiences with congenital heart disease when they were young.	Heart Warrior! Had pulmonary valve stenosis, subvalvular stenosis, and artery stenoses all surgically helped in 1993. Another surgery down the line. Fundraised and walked for CHD, grateful for those who also support current and future heart warriors!
3	Risk-reduction discussion	0.042*heart 0.026*disease 0.016*eat 0.016*healthy 0.014*red 0.012*diet 0.012*health 0.011*smoke 0.010*exercise 0.010*risk	Discussion on risk factors and risk reduction to prevent heart disease and improve health (eg, diet, exercise, and smoking cessation)	A healthy lifestyle helps! Water over sweetened beverages and being active keeps the heart healthy! My family has a high BP history, and I need to reduce the sodium in eating, as well as walk more.
4	Religious content	0.061*thank 0.031*god 0.029*good 0.020*bless 0.018*love 0.017*share 0.013*great 0.011*family 0.010*happy 0.010*amaze	Religious content—thanks to God and others	H is beautiful in the pictures, I wish [H] luck. [H] is amazing and kind, Peace with God. It calmed me, and I prayed. I'm doing well after 5 hospital visits, thank you Jesus. Blessed and at home with family.
5	Asking medical questions	0.121*heart 0.097*attack 0.017*congratulations 0.017*women 0.013*symptoms 0.012*sir 0.012*sign 0.008*cause 0.007*patient 0.006*patients	People ask physicians about heart diseases and risk reduction.	What are the precautions for a silent heart attack? Can it be removed? Women’s symptoms are different from mens (not as widely known)
6	Sharing appreciation and information	0.031*great 0.031*love 0.028*information 0.024*nice 0.023*awesome 0.019*sir 0.018*good 0.017*dr 0.011*job 0.011*pressure	People appreciate good information shared by others and organizations and share with their Facebook friends by tagging their names in the comments.	Dr. W, Dr. M; they listened and respected me. Good information in understandable language.

^aThe asterisk (*) shows the weight of each keyword.