Devise and OmniAuth - correct approach?

Hello,

I decided to start building a social media scheduling tool as I figured it would be decent portfolio project for a junior dev. I'm a little confused as to how to integrate Users' social media accounts (Twitter, FB, Insta) within the app. I was thinking I would use the Devise Gem for authentication and then OmniAiuth.

But all the OmniAuth guides talk about logging in with social accounts, I don't want that functionality. I just want to link their social accounts to their existing account and then allow users to post to multiple social sites.

Is OmniAuth still the correct gem to be looking at? If not what's the best way to approach this?

Cheers,
Christian