@tags are also called At Tags, they are used for people, businesses, organisations, brands, web sites etc…

e.g. @pete @laura @coke @coca-cola

They will appear in your contacts automatically.

You can use twitter handles as the @tag but they are often hard to remember. Just use the words you would normal use in everyday conversation. e.g. if you knew two people called Daniel they might be @danf and @danc. Coinr will keep them separate and later you can link to other systems if you want.