Especially with digital products, so many things come into existence quickly, continuously checking in whether something exists or not can take a lot of time and attention.
“Dropping” would be a simple web app/social network that would let people post something like “Trello GitHub Issues integration” or “cheap coworking space in Humboldt Park” and when such a thing drops, another user could click “It’s dropped” and insert a URL to that thing. Users would get a notification when something they’re waiting for drops and be able to confirm whether it really meets their needs.