I think all social media links should be nofollowed!
Do you think that your social media profile will benefit if you link to it with dofollow? No! Who will benefit from it? The social media platforms and your competitors! You and your website won't get any benefit from it, rather them!
In Google you will always want your website to be first, not your social media pages.
Anyone who want to find your social media pages will find it anyway.
You nofollow all external links except social media pages? Why do you give any credit to them? Then people wonder why Facebook rules the internet...
