The following blog and repos may prove helpful to anyone wanting to integrate an arbitrary OAuth service provider with Meteor. They show the steps and code needed to write an Imgur OAuth handler, which may be readily adapted for other services.
blog: http://robfallows.github.io/2015/12/17/writing-an-oauth-2-handler.html
repos: https://github.com/robfallows/tunguska-imgur and https://github.com/robfallows/tunguska-accounts-imgur
The working packages have been published to atmosphere, should anyone need a quick route to authenticating with Imgur.
Enjoy 
