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Your Custom Text Here Our mission The Spinsters of San Francisco SOSF is a social and philanthropic organization of young professional unmarried women unique to the San Francisco Bay Area. Since 1929 SOSF has created a strong network of women who make a positive impact in the community through volunteering and fundraising events. Events We provide over 50 events for our members every year. From volunteer opportunities to fundraising parties to small social gatherings members give back to the community and get the most out of life in the Bay Area.