A device may include a storage medium and a processor. The processor may execute a set of instructions in the storage medium to: provide a first platform; provide a first user account registered in the first platform to a user; access, through the first user account, a second user account of the user registered in a second platform; obtain, from the second user account, a communication log of the second user account; obtain an address list from the second user account; obtain a plurality of contacts from the second user account who have a prior communication with the user through the second user account based on the communication log; select, from the plurality of contacts, at least one recommended contact for the user; combine the at least one recommended contact with the address list in to a combined list; and display the combined list via the first user account, highlighting the at least one recommended contact to the user.