You shouldn't have to follow up, but ask them if they are still interested.
People are really bad at saying, 'something came up' or 'i've lost interest.
Don't do 20 questions, add all relevant info in the description and direct them to it if they ask.
I've had success on the app, but have had this happen as well.
Usually have pre-made responses on clipboard.
"Please read all relevant info in the description so there's no confusion. I'm able to meet weekdays at 3p in Temecula Ave and Johnson Blvd"
On the topic of Craiglist, most users post on more than one platform.
It helps extend your reach, but it doesn't necessarily mean you'll have better luck there.
If there's a want / need for your item someone who's serious will eventually inquire about your listing and follow through.