I want to offer a counterpoint to the current consensus in the comments from (my) real-world interactions. In many countries outside of US, Twitter is occupied by a minority audience which is usually in its own bubble. Instagram is much more popular especially in Millenials who are now in the age group where they start to be more politically active and less motivated by the "pure entertainement" side of the social media.

Facebook, is dead for them in terms of engagement because its the "old people" place and discoverability is quite bad outside of groups. I know many people who use Instagram for social/policy commentary in their stories, and its very inefficient because its one-way. Pictures do not allow for proper discussion or easy discoverability of comments.

Even tiktok has better interaction via duets and pushing up new content all the time but conversation is limited.

I believe that instagram is mainstream enough to entice this group into a forum-like experience and drive insane engagement. Currently, if you are not traveling or doing some kind of beauty influencing, instagram is dead and its successor (tiktok) is limited to short videos. There is a legit market for more long-form/term discussion place in that (very important) age group outside of the US especially.

I am bullish on the offer, especially since Twitter seems to be prioritising US.