I think you have to take a lot with a pinch of salt. Banter, flirting, hugs and kisses...it's harmless. It would be very different face-to-face, but there's a natural distance here. Also, things can look very different in print than they would sound if you were speaking. There's no facial expression, body language or tone of voice to help. I often avoid posting something as i can be quite cheeky in real life and it might just come across as rude, if i typed it.