Possible Clues:

• Acronym after a long online paragraph
• Letters before an online summary
• 'I know this email is super detailed, but here's the important stuff:'
• 'Sorry, but I'm skipping your novella of an article,' in Internet shorthand
• Internet shorthand before summing up a wordy post
• Initials before a summary
• Acronym after a long paragraph
• Texter's ''Couldn't finish this article''
• Modern initialism for one skimming text
• Letters before a summary