just checked who isn't following me back and who's inactive.
mini app by @cashlessman.eth

Whatever your decentralized, borderless, neutral, censorship-resistant open blockchain question is, the answer is YES… to Crypto!

thanks for the share, did it work properly ?

I saw people I followed not following me, but I did not see a last active.  I tried on mobile only.

I also then remembered
1. I follow high profile accounts unlikely to follow me 
2. I joined a couple starter packs and followed a few in bulk
3. I don't care about follow-backs anyway

either way, cool miniapp!