NEW YORK, Feb 7 (Reuters) - Singles looking to find love online might want to head to Atlanta, which was ranked on Thursday as the best U.S. city to connect on the web, while Laredo, in Texas, was considered the worst. The southern metropolis scored best in the ranking compiled by Men's Health magazine, which looked at the number of members of six popular online dating sites in each city and the percentage of households using online dating services.