Related Clues:

• Write by the phone
• 'Where u @?' missive, e.g.
• Definitive
• One begins 'By the rivers of Babylon, there we sat down'
• Communication that might include 'OMG' and 'TTYL'
• Pupil's book
• Write to on a cell phone
• Send a high-tech message to
• Student's buy
• The 23rd is a famous one
• Tutor's offering
• Chalk talk, perhaps
• Song used in worship
• Communicate by thumbing
• '___ learned ... '