Writeous Sister offers comprehensive guidelines on the adab / etiquettes of on-line advice.
InshaAllah, through a little bit of thought, we can save alot of hurt feelings between brothers and sisters. While we all think that giving nasiha is something we have to do, there are specific adab issues involved and we really should consider whether we are qualified to be giving advice. Time, place, and other matters come into play when factoring in the appropriateness of giving nasiha and we must think about these things in advance.
