Facebook often undertakes data studies to coincide with current events, holidays, and pop culture moments, but the sites Valentines Day research results are particularly interesting. First off, Facebook says that San Francisco residents have the smallest chance of getting into a relationship among people in any of the 50 largest American cities. If youre looking for love, Facebook says, your best bet is Colorado Springs, CO, a city that boasts the largest probability of relationship formation. San Francisco also ranks as the city where single men most outnumber single women, Facebook says, and Memphis ranks as the city where single women most outnumber single men. Facebooks results are markedly different from the Top Cities For Singles data offered by sites like Kiplingers and Travel Leisure. Cities like Milwaukee, however, seem to shine through as a great place for singles.