Well, do you know how a cow hums? Here they are as well, you just need to think and come to the conclusion that girls in social networks do not write, but moo, well, you yourself understand MMM is like muuu
I write this when I take offense at a guy, or when I don't like something about his actions.
Sometimes it just replaces "clear", "understandable", or lack of confidence in the veracity, correctness of your statement ... As mentioned above, it all depends on the context. There are many options.
This means that you didn’t say exactly what you wanted to hear from you. For example, I wrote “I miss you terribly, I hug you very much”. And in response to me: "Good night." For instance. Well, you get the idea. Try again or don't fool me.
Most likely nothing good;). If the value were positive, the question would not arise. And the speech, of course, is not in the "female language", but in the abstract manner of expressing thoughts, to which many representatives of the fair sex are inclined.