Apart from infidelity, what is a big 'no, no' in a relationship?

@SW-User Flirting online while you are still married. My sister-n-law discovered Facebook and it's been hell on wheels ever since. My brother swears he's going to give her a divorce for their anniversary.

@MaryJanine I didn't mean flirting. Of course that would be wrong and unfaithful. I'm specifically referring to chatting without knowledge.

My husband is free to read anything that I type to any person on line if he wishes to do so. I@SW-User

@pennynoodles Your husband is reasonable. My sister-in-law openly FLIRTS. Men she has never met open with "Hi, baby!" and they ask her for money to come see her, or ask her to leave her husband and come to stay with them. And she doesn't discourage one of them.

@MaryJanine That is definitely wrong behavior.

@SW-User I know that. Tell me about it. She thinks there is nothing wrong with it - they are "friends". She is an infant as far as social media is concerned. She doesn't realize not everything is truthful on there and you CAN get into serious trouble with what you post.