There's a difference between a product with two tiers and a company with two products. I would not say that Google Search was a free tier of Google AdWords, even if every AdWords user is also a search user, as they're different products.

Likewise, there's not a paid Facebook Premium tier or a paid Instagram Pro version.

The closest things to social networks that have a paid tier within the social media product are the likes of Tinder, Strava and perhaps LinkedIn.