Incidentally, in chat room shorthand

• FYI cousin
• "Incidentally," to texters
• "While I have you ...," in a text
• "Incidentally," in IMs
• Texter's "Also ..."
• Incidentally, in texting ... and a hint to three long puzzle answers
• "Incidentally," on IM
• Cousin of FWIW
• "Oh, and did I mention ...," in netspeak

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
Internet abbreviation of by the way , in use by 1989.