Putting a Message on Twitter; Singing Like a Bird

This page is the CodyCross answer for the clue below from Train Travel, Group 707, Puzzle 2 (Eurotunnel).

Question is: Putting a Message on Twitter; Singing Like a Bird

and the answer is: TWEETING

Word Meaning:

TWEETING — present participle and gerund of tweet

Definitions from Wiktionary.