Social.
"Just want five minutes' chat with you;"
i.e., "He'll give me a cigar and something to drink, and as I've nothing to do for half an hour, this will occupy me pleasantly."
"Yes; I quite understand;"
i.e., "I don't know what he is talking about, but he's a bore."
"Wouldn't tell it to anyone but you;"
i.e., "This will ensure its circulation."