Users socialize online to make contacts in real life. At times, this is not the case as sometimes some users do make false identities for themselves. They do this not necessarily to deceive someone, but to avoid being recognized themselves. Facebook, which is the largest social networking site in the world, has been known to identity false identity users and shut down their accounts. It requires real data to able to sign up to the service.
Google has launched a number of ventures which follow the model of Yahoo Answers and other question/answers sites to some extent. Most of these ventures didn't conclude very successfully. The earlier service by Google, Google Questions and Answers, also involved a monetary aspect and thus never gained momentum. However, the latest launch by Google in this domain is Google Baraza. Google Baraza is a community-based resource venture where people ask and respond to questions. Moreover, it's target audience is African nations.