That was my night last night. My face-to-face and my Facebook interactions just went awry because there is no universal signal for "stop I've had too much. Pretty soon I won't be able to deal with you or the rest of the world." Why we have not developed such a hand signal, I'm not sure; but it needs to be done. Now "the professionals" can talk about non-verbal cues, but we have gotten better at hiding those cues, or in the case of Facebook there are no cues. In some ways it's like operating in a vacuum. You post a comment and hope for the best.
My apologies are posted. But words are only half the equation. For my friends or those who wonder if I'm their friend, I will give away my biggest non-verbal cue: I share food with you. Or I go out of my way to bring food to you. If either one of those things has happened then you are loved by me. Quite dearly. As for the rest, we just haven't gotten there. And don't feel bad if we never do.