The days of having a separate login and password for each online service we use are behind us. Now, you can log into most sites and services using your social network’s ID. The most popular social identities are Facebook, Google, Yahoo, and Twitter, but are they always being used in the same way? The infographic below, courtesy of social optimization platform Gigya, shows that users trust different identities on different services. For example, users are most likely to log on to entertainment sites via Facebook, but when it comes to news sites, the login of choice is Twitter. Furthermore, the infographic shows what profile data is available to services after users log in using various online identities.