Last updated: June 26, 2026
echooo (the "Service") is a free web application that visualizes connections between people and organizations based on publicly available information, using the concept of six degrees of separation. Registered members can also add celebrities and organizations as their personal acquaintances and use those connections in route searches.
Some features of the Service (registering acquaintances, participating in routes, etc.) require an account. You may sign up via Google Sign-In or email magic link.
Please provide accurate information when registering. Creating accounts that impersonate others is prohibited. The operator may delete accounts that violate these Terms without prior notice.
Users may register celebrities and organizations as personal acquaintances ("User Content") and attach memos to those connections.
User Content is used to power the Service's route-finding feature. By registering a connection, you confirm that it is based on a real relationship. Registering false or fabricated connections is prohibited.
You retain ownership of your User Content. By using the Service, you grant the operator a limited license to use your User Content solely to provide the Service.
The connection data displayed in the Service is based on publicly available sources such as Wikidata. We do not guarantee the accuracy, completeness, or timeliness of this information. The operator shall not be liable for any damages arising from use of the Service.
The Service may be suspended without notice due to system failures, maintenance, or other reasons.
All intellectual property rights related to the design, code, data structure, and logo of this Service belong to the operator. Users may not reproduce, modify, or redistribute these beyond personal use.
The following activities are prohibited:
· Scraping the Service or using the API commercially without authorization · Registering false acquaintance relationships · Impersonating any person or entity · Interfering with the normal operation of the Service · Any act that violates applicable law or public order · Any other activity the operator deems inappropriate
You may delete your account at any time via the "Delete account" option on the Account page. Upon deletion, all your data — including connections and memos — will be permanently removed and cannot be recovered. For details, see our Privacy Policy.
These Terms may be updated without prior notice. We will notify you of significant changes via the Service. Continued use of the Service after changes constitutes your acceptance of the modified Terms.
These Terms are governed by the laws of Japan. Any disputes arising in connection with the Service shall be subject to the exclusive jurisdiction of the court having jurisdiction over the operator's location.