Replies are where conversations on X happen
On X, the post is the opening line and the replies are the conversation. Readers often open a popular post just to see what people said under it, so a good reply can be read by many of the original post's readers.
The drafts for X are written as replies: they make one point, fit easily under the character limit, and do not repeat the original post back to its author.
Paste the post's text into the box, and if it is part of a thread, add a sentence about the rest of the thread so the replies fit the discussion.
Tone on X
X rewards directness, and a reply that hedges every sentence gets skipped. But directness is not hostility: a funny reply that punches at the author tends to start a pile-on rather than a conversation.
"Thoughtful" works for replies to opinions and long threads, "funny" for light posts, and "professional" for industry news where people are reading for information.