| SNAPCHAT | Instant messaging service whose messages are usually only briefly available (8) |
| AOL | ___ Instant Messenger aka AIM instant messaging service that was popular in the '90s |
| SKYWRITER | One whose message we look up to (9) |
| AMA | "I ___ Rock" (Simon & Garfunkel tune whose message is not "I rock") |
| BEATLES | Group whose message song may be found from the first words of 18-, 28-, 35-, 46-, and 57-Across |
| WHATSAPP | A free, cross-platform messaging service allowing contact using a wi-fi connection (8) |
| PROBABLE | Infant only briefly to be kept by poor labourer? It's likely (8) |
| ORGANIST | Worker in service whose contribution may be partly voluntary? |
| CALENDAR | It usually only lasts twelve months |
| TELEGRAM | Instant messaging app founded in 2013 by Nikolai and Pavel Durov (8) |
| SEATERMS | Text messaging service swallows consumer's main words |
| EMOTICON | Symbol used to convey emotion, especially on messaging services (8) |
| HAMRADIO | Amateur radio (with a meaty name) involving noncommercial two-way radio communications. Messages are sent either by voice or in International Morse Code. (3,5) |
| UNSPOKEN | Understood as text messages are? |
| MAVERICK | Independent state accepted in name, only briefly |
| ONTHEJOB | Working only briefly, the Jones boy getting confused (2,3,3) |
| NEONATAL | At a loose end only briefly in the North just after the birth |
| IMPRIMIS | Proper lives led by instant messaging in the first place |
| EPHEMERA | Things lasting only briefly |
| SAMOS | Foreign food briefly available in this Aegean island |
