In one embodiment, a request to share a message is received from a first user. The request includes a first location, the message, and note-access criteria for sharing the message based on one or more groups of second users. A particular second user is identified having a second location that is within a threshold distance of the first location. Based on the note-access criteria and one or more groups associated with the particular second user, it is determined that the message should be shared with the particular second user, the message is sent to the particular second user, and a location of the first user is determined to be within a predetermined distance from the first location. If the first user is currently within the predetermined distance, a notification is sent to the first user informing the first user that the message was sent to the particular second user.