I have an online contact who continually contacts me with "hello" and sometimes smilies.
they then refuse to have any other conversation than "how u" and single word replies. They cant be too busy to talk or they wouldnt contact me.

Right over on the other side of the spectrum, recently I was in the kitchen making soup. Someone new has requested being added to my skype. so, I added them. when I got back to my computer with the soup, (six minutes tops) I fount this new guy had already sent the following:
"hiyas"
"lol!"
"it polite to talk!"
"why no rely?"
"talk to me" (about eight times)
"I block now! you rude."

phew! dodges a bullet there!