I am proficient in multiple variants of my language, which should I add?

You should add those variants that you are most comfortable with. In many cases these will be the ones that you have worked with the longest, but may in fact be those that you currently use on a daily basis. You can indicate your level of familiarity from a drop down menu when adding or editing your language variants.

In the case of your native language(s), only those variants that you report a high familiarity with will be displayed on the corresponding section of your profile. If you report a high familiarity with several variants, only the first two will be shown.