Table 1. Topics inferred from a joint analysis of the r/AncestryDNA and r/23andme subreddits.

Label	Most Relevant Termsa	Distribution
Kinship	family, dad, father, mom, parent, cousin, great, side, half, mother, match, share, find, tree, grandfather, sister, grandmother, sibling, child, brother	0.119
Health Risks	test, genetic, datum, gene, information, health, give, good, company, andme, testing, research, promethease, work, read, issue, problem, run, raw, service	0.115
DNA Matching	dna, ancestry, andme, show, relative, country, ancestor, grandparent, report, match, percentage, test, share, population, customer, change, bear, accurate, base, recent	0.115
Feelings	make, find, good, thing, feel, time, give, happen, hear, question, talk, story, life, answer, contact, idea, work, hope, wrong, guy	0.112
European Ancestry	european, german, italian, irish, french, ancestry, british, europe, broadly, jewish, ashkenazi, eastern, southern, region, scandinavian, high, english, iberian, ancestor, expect	0.112
General Ancestry	american, native, asian, african, white, south, east, european, north, people, group, spanish, chinese, mexican, part, black, mix, west, mixed, middle_eastern	0.111
Haplogroup	people, lot, back, pretty, year, haplogroup, common, ago, interesting, live, family, cool, history, line, guess, true, make, generation, lol, bit	0.110
Sharing Results	result, https, andme, imgur, post, reddit, update, gedmatch, www, guess, phase, link, comment, upload, site, ancestrydna, myheritage, http, test, add	0.104
Testing Progress	day, kit, receive, extraction, week, sample, time, wait, mine, send, analysis, long, report, today, email, update, check, generation, step, process	0.103

^aThe terms were ranked according to their probability in the distribution per topic. The labels were assigned by the authors as a readable summary of the topic.