babbling, blabbing, cackling, chaffering(British), chattering, chatting, chinning(slang), conversing, gabbing, gabbling, gassing, jabbering, jawing, kibitzing(also kibbitzing), nattering, palavering, pattering, prating, prattling, rapping, rattling, running on, schmoozing(or shmoozing), talking, twittering, visiting
gossiping, tattlingdescanting, discussing, expatiatingyakking(also yacking), yammering, yapping
blowing smoke, shooting the breeze, talking a blue streak