Nobody signs a lease off a post, and that was never the argument
Concede the last step. The channel is not there to close a deal, it is there to reach the people your relationships cannot reach.
The last step in this business is a conversation between people who have met. Nothing published on a feed replaces it, and anyone selling you otherwise is describing a different business.
Referral networks have a shape, and the shape has a hole in it. A newcomer to the market, an out-of-state owner, a corporate real estate manager running a search from another city: none of them has anybody to ask, so they search, they read, and they call the firm that looks like it knows the submarket.
Judge the program by what a first call sounds like. A caller who already knows which corridor you work, which product type you handle and roughly what you think of the market is a different conversation than a cold one, and a much shorter one.
Follower counts answer none of that. The scoreboard worth keeping is named requirements, invitations to pitch, meetings held, and what a new caller repeats back to you at intake.