Related Clues:

• Note from a small bird
• Message that might include an '@' and a '#'
• Twitter, chirp repeatedly
• Fledgling's sound
• Greek character raised contented noise to sound cheerful
• Twitter, initially, could help idiots sound happy when upset
• Response initially outlined by token tweet
• Ultimately, what takes little time to post?
• During races, there's little noise from bird
• Communicate in a way that's short, time after time
• Precious time needed for throwaway message?
• Bird's chirp
• Sound from above
• Message to one's followers
• Message, small, delivered in double time