Hi,
Completely trivial question but...
Say a couple ask you over for dinner, and while they're nice people and have made an effort, you just don't 'click' with them. You have plenty of other friends whose company you really enjoy, but you don't have time to see them as regularly as you'd like.
Do you:
a) Ask them back and get embroiled in an endless loop of reciprocal dinner parties til you drop dead. Who knows, you might eventually enjoy their company!
b) Ask them back but take increasingly long periods to reciprocate until they get the message. (This too might take a while.)
c) Don't ask them back and accept that they'll be pished off. Hey - you're a busy gal - things to do, people to see!