Should I use set-type for user's country info in MySQL?

Should I use set-type for user's country info in MySQL? Or, it is better to have an another table for that? It is going to be some kind of social network question an开发者_StackOverflow中文版swer thing, thus, in every page will be displayed in every post, like 15 times in every page. Also, the departments will be set-type to, like stat, math, ceit, phys, ee...

Is set-type better than having separate tables for that?

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You will want a separate table only if you will want to associate some information with countries, make some relations and so on.