Most Success on Sponsored Posts on Which Social Media?

Hello all! Just out of curiosity, where are you guys finding your best ROI in terms of paying for Social Media Ads on Facebook, Twitter, or Instagram?

I've been spending a whopping $10 per week on FB, and I believe I'm finding a positive ROI. The company sure makes more, but I'm having a hard time telling if the valuable traffic and sales are from my FB ads. Another reason I spend money on FB ads is because I have a much larger following for the brand on IG and Twitter, and have not found it necessary to spend money there. But if some of you guys out there are finding success there, I'd love to try it.

To confirm, this is for an e-commerce company. But I am open to hearing about your CPA ads as well since that seems to be most popular right now.

In my experience is Facebook, for sure, but it really will depends on the niches you're comparing, there are niches which the engagement is higher than the others, you know.