Yahoo Groups are like communities that share the same hobbies or anything from music to arts. They also have YahooGroups owners more like Forum Admins and Moderators, Members can post files, send messages to the group! Post pictures and more.
So if you're planning to use Yahoo Groups for SEO, try to analyze which category of the groups do you belong, from there, simply join em, make friends, and inform them about your site. careful not to spam, you can also be banned by the group owners.
Hope that helps!
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