Facebook uses a simple Search feature. When a person is a member, their User Name is automatically added to that Search database on Facebook. This database is also used in Google searches, such as if you use the search term Facebook+User Name. If you can no longer find that specific person in the Facebook Search database, the person may have:Changed their User NameDeleted /closed their account completely. For example, a parent of a pre-teen may have asked Facebook to close a child's account because the user is not of an age to be on Facebook.Or, perhaps Facebook permanently blocked the User's account
Rothschild says Facebook is now running 10,000 servers, including 1,800 MySQL servers that are overseen by just two database administrators. This information was provided by Facebook VP of Technology Jeff Rothschild himself in a panel at the recent MySQL user conference.
Simply go to Facebook search by city's page , type the name and city name of the person and click search button
test
Wikipedia uses MySQL as its database.
business database management
Facebook uses the HTTP Protocol
they use a database because it helps them count up stuff and so on!
database
Database system can be defined as the collection of interrelated data. Uses of database system are that it maintains data security , data integrity, data can be easily accessed and shared too.
Different languages like Java, Python, PHP, C++ and Ruby building its stack that allows to all languages stated to interoperate.
If your Facebook profile gets hacked ask your 10 friends to report it. Once the reporting is done Facebook reviews the report and suspend the profile from their database.