post (online); comment (online)
Internet slang abbreviation of 書き込み. Used for posts on BBS, blogs, forums, and similar platforms. Casual and informal.
See also: 書き込み
I posted on the message board.
Thanks for posting in this thread.
The blog got a lot of comments.
スレにカキコを入れた。
I left a comment on the thread.
matter; affair; case; item; subject · counter for received messages · counter for online accounts
Abbreviation of 書き込み (かきこみ), clipped to カキコ. The exact origin is uncertain, but it likely emerged in early Japanese internet communities.