we've all probably been doing this for years.
What's your top page for "Most fat on the internet"?
I stumbled into this one and had to share, has many girls I've never seen.
https://cutefatbabeee.tumblr.com/archive
You do have to scroll through some of the dudes, but def some hidden gems in there, I didn't make it to the end of the list either, just keeps going...

I am looking for a social media aggregator where you could search all posts containing images by hashtag.

currently it's manual or google ex: site:tiktok.com ssbbw and sort by last week or 24hrs

If we’re talking Tumblr, I HIGHLY recommend following
https://ssbbwchan.tumblr.com/
They regularly link to lots of models, both community faves and hidden gems, and post some truly incredible USSBBW GIFs. Best “one-stop shop” for fat I’ve found outside this site, and great for discovering new models. I just wish Tumblr allowed full nudity.