The snowball sampling method can be employed in

Snowball sampling can be employed in ethnographic research, where initial contacts refer the researcher to further participants.

It suits hidden or hard to reach groups that lack a sampling frame.

Historical research uses documents and relics, not chains of referrals.

Content analysis samples texts and messages rather than networks of people.

Narrative analysis studies the stories told, not recruitment by referral.

Snowball sampling is a non probability method prone to network bias.