Table 2.

Brand-name group information, including key terms, count, and percentage. The qualitative themes were generated based on the top 10 terms seen in Since only 5 topics were found from the BERTopic model, the topics and groups were able to be matched with each other easily (n=245,145).

Group ID	Overarching themes	Topic IDs in group (topics forming groups in Figure 2)	Document count, n (%)
A	Adderall, Ritalin, ADHDa, stimulant use	0	76,798 (31.33)
B	music, concerts, posts unrelated to drug use	4	31,916 (13.02)
C	psychedelics, LSDb, hallucinogens	2	40,001 (16.32)
D	Xanax, anxiety, depressants	3	37,048 (15.11)
E	fentanyl, overdose, US politics	1	59,382 (24.22)

^aADHD: attention-deficit/hyperactivity disorder.

^bLSD: lysergic acid diethylamide.