Sayyiduna Abu Darda (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: Whoever hears something from a man, and that man does not want that thing to be mentioned with reference to him, then that thing is a trust, even if the speaker does not instruct to keep it secret.
Hadith Referenceالفتح الربانی / مسائل الأخلاق الحسنة وما يتعلق بها / 9236
Hadith Gradingمحدثین:ضعیف
Hadith Takhrij«اسناده ضعيف لضعف عبيد الله بن الوليد الوصافي، وعبدُ الله بن عبيد بن عمير لم يذكروا له سماعا من ابي الدرداء ، (انظر مسند أحمد ترقيم الرسالة: 27509 ترقیم بيت الأفكار الدولية: 28059»
Brief Explanation
Benefits: … However, it is an accepted fact that a person should, of his own accord, understand which matter or thing is a trust (amanah); it is not necessary that it be explicitly emphasized that such-and-such matter is a trust, take care of it. Consider the following example:
Sayyiduna Jabir bin Abdullah radi Allahu anhu narrates that the Noble Prophet sallallahu alayhi wa sallam said: “When a man speaks a word and then looks around (to see if anyone is listening or watching), then that statement is a trust (amanah).” (Abu Dawud: 2/297, Tirmidhi: 1/355)
Imam Mubarakpuri rahimahullah, while explaining this blessed hadith, wrote: If a person is conversing with another and, during the conversation, looks to his right and left, then it should be understood from this that he wishes to speak confidentially and wants to keep it hidden from others. Such a conversation will be a trust (amanah) and it will be obligatory to keep it secret. Ibn Arslan said: From the speaker’s looking around, it is understood that he fears someone else might hear his words; he only wants to keep his secret safe with his companion in the gathering. In reality, by looking around, he wants to say to his addressee that he should listen to his words and consider them a secret and a trust (amanah). (Tuhfat al-Ahwadhi)
But in our society, even after explicit emphasis, specific gatherings are not considered a trust, and matters are exaggerated and broadcasted.