Answer: twittering

AnswerCrossword Clue
twitteringMake a posting on the social networking site Twitter
twittering(of a bird) Give a call consisting of repeated light tremulous sounds
twitteringTalk in a light, high-pitched voice
twitteringTalk rapidly and at length in an idle or trivial way
twitteringTWITTER, to chirp (to utter a short, shrill sound)