I don’t think they’ve been online long enough to have much relevance to the point of this article though.
I agree all those things are true, but I don't see how they are relevant to the point. Are you perhaps claiming that social media evolved differently in some of those countries and so one of them serves as some sort of contrasting example to the article?
2. Most of these countries came online only in the mobile era
3. Many of these countries have Facebook and broadly, Internet usage that eclipses US and Europe.