A computer-implemented method includes storing data in a memory area such that the data is organized into a plurality of workspaces including a first workspace, creating a second workspace within the memory area, and copying at least a portion of the data from the first workspace into the second workspace. The reflection electrode has a double-layer structure of a first metal layer containing Mo and a second metal layer containing Al formed on the first metal layer. The clutch disk assembly 1 includes a friction facing 20, a pair of plates 15 and 16, a hub 8, and coil springs 11. When communicating about a user with an installed application associated with the user, the online system identifies the user via the application-specific identifier associated with the installed application and may provide limited information associated with the online system user identifier associated with the application-specific identifier.