I discovered emoji .to domains ~7 years ago and put up a site listing all the available ones [1] Within a few days almost all of them sold and made a couple grand in affiliate commissions. Unfortunately they aren’t as well supported as I’d like and so they turn out to be mostly a gimmick. [1] https://xn--f28h.to/. - Source: Hacker News / about 2 months ago

If you have an idea on what you might want,NameCh_k is a website that can help you find a username that no one else on the internet has across multiple social media platforms. Source: 12 months ago

If you want to be sure a name is not already being used, and if you want to make life difficult for yourself, check out https://namechk.com/ It will check thirty domains and ninety platforms. Bound to be something in use somewhere. Source: about 1 year ago

If it creates a publicly findable username like most social networks, then https://namechk.com/ can help. But anything else, no. Source: over 1 year ago

This website is good at checking if domain names and social media accounts are taken. Source: over 1 year ago

Then use a service like https://namechk.com to check availability across social media platforms as well as domain names. Source: over 1 year ago