That's solved by being stingy with your follows and not being afraid to unfollow people. From my experience I have zero issues keeping my stream focused on finance (though i do follow one or two comedy accounts that post every once in a while)
I feel Instagram is 100% influencer focused -- i.e. sponsorship focused -- with just enough "friends and family" to not make it feel like an advertisement show.
You know how music on a commercial radio station is there to fill gaps between ads? That is Instagram and Facebook! Same concept but "done with computers". :)
Not judging, just expressing my disappointment about the lack of honest separation between ads and private life.
Isn't RSS more suitable for this? Subscribing to feeds from finance news sites?
On the other hand, there are topic centric social networks like Reddit where it's a lot easier to find and follow just the news about a specific niche (like finance).
I'm not totally against the people centric model. I think it can work well in social networks like Facebook and Instagram that are more friends and family focused, but I don't really get that vibe from Twitter.