1. In a medium pitcher, combine strawberries, lime juice, sugar, and mint leaves, and crush with a muddler or wooden spoon until the sugar is dissolved, about one minute. Add the rum and stir gently.
2. Fill four glasses three-quarters full with ice. Divide the mojito among them and top each with about one-fourth cup seltzer. Garnish with mint sprigs, lime wedges, or strawberries.