Sounds like Mastodon to me. You can even interact with Lemmy through Mastodon. Though I think it works the other way around. At least not at the moment.
Fediverse
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Rules
- Posts must be on topic.
- Be respectful of others.
- Cite the sources used for graphs and other statistics.
- Follow the general Lemmy.world rules.
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
Maybe you could create a community for blog readers.
Have you checked out Mastodon? Idk if it's exactly what you are looking for since it's more akin to Twitter but it has hashtags that you can pin to keep up on. There's some stuff that's more longform and visual on there too or at least people will link to there stuff if it isn't listed there. Maybe try a couple different apps, I use megalodon, see if does what you need.
There's also Friendica, it's more often use for #blogs while Mastodon mostly used for #microblogs
You can also follow #Lemmy communities using #Friendica groups feature
RSS feeds are your friend.
An RSS feed for blogs that don't implement ActivityPub?
You’re wanting pixelfed if you’re missing instagram. But as far as blogs, Wordpress has implemented activity pub.
boredreading.com is a blog feed with hashtag/topic subscriptions but it sounds like that’s not really what you’re looking for?