The embodiments of the present invention disclose a method and a system for unified instant messaging application/service that enables to concurrently send messages via online mode using internet and Offline or Airplane mode using WI-FI direct service/Bluetooth/WIFI. The instant messaging application first checks the contact to which message is to be sent is in its local vicinity. Once the contact, to whom a message is to be sent is available, and in the local vicinity, the messages are sent by WI-FI direct service/Bluetooth/WIFI without using the internet. If the destination user is not available nearby, then a message is delivered to an internet server or saved to history for delivering the messages to the user when the user is available, or internet is available. The messaging application also allows users to broadcast any question or information to nearby users without being connected or without using the Internet. The instant messaging application also displays different available users on a geographical map with a visual indication. The visual indication allows a user to identify as who has similar interests or different interest.