When you run a giveaway on X or Instagram, the hard parts are choosing the winner and contacting them. Picking by hand from the comments invites "Was that really random?", and tools that only pick a number don't tell you who won. This article shows how to pick the winner with Amidakuji and DM them right away.

On Amida-san, participants enter their own name (display name) to join the Amidakuji. Ask them to use their social media handle as that name.
If an entrant joins as @tanaka_design, that handle appears in the results too. You don't need to match winners against a separate list; you can DM them straight from the result.

Turn on "Require unique display names" under "Additional Options" on the edit page, and a name that's already in use can't be used to join. This stops repeat entries under the same handle. The setting is free. Turn it on before entries start coming in.

However, there's no way to verify that an entered handle belongs to the person who typed it. Someone could join first with another person's handle, so when you contact the winner, confirm in the DM that they are the account that entered.
Because the result is decided as balls trace the lines, posting the result screen or showing the start on a livestream lets followers see you chose fairly. For extra visual effect, you can use Amida3D.

Announce conditions such as "follow and repost to enter" in your social media post. Amida-san doesn't check whether entrants met them, so verify when you contact the winner. Also check beforehand that your campaign follows each platform's promotion rules and any local laws on prizes and sweepstakes.
Yes. Creating an Amidakuji and the "Require unique display names" setting are both free. Up to 299 people can join one event.
No. They open the URL and enter their own @handle.
No. Amida-san doesn't send DMs, so the organizer contacts winners from their own social media account.
Have entrants join with their @handle and turn on "Require unique display names," and you can DM winners straight from the result. Checking that the handle really belongs to them and that they met the entry conditions is still up to you, so confirm both in the DM when you contact the winner.
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