Amish have no matchmakers. No Tinder. No dating sites. They have: singing, church, market, and moms.
Moms
World's most effective matchmakers. 'Miriam, you know the Stoltzfus boy? Good lad. Hard worker. Big farm.' Casually. At dinner. Between Shoofly pie and prayer. Daughter rolls eyes. Six months later — in his buggy after singing.
Regional Singings
Once a month: 3-4 communities together. 30-50 young people. Sing hymns (3 hours). Then socializing (2 hours). Then boys drive girls home. This is Tinder. Only slower, more honest, and without photoshop.
Rule
Can only marry Amish (from your order). Mennonite — no. English — no. Amish from different order (Old Order + New Order) — debatable. Choice: 5-30 people. In a world of 380,000 Amish — you date the 20 who live within 10 miles.