I don't think that's what that number means. If you paid that value in dollars, then Facebooks revenue-tie-to-network effects is gone. Facebook currently has the ability to 'innovate' on the data you provide and presumably convince investors that the value will rise over time due to Facebook's own engineering talent. On the other hand, if you are paying a flat fee, the entirety of Facebook's business model falls flat - that it can increase that value without you knowing. Could Facebook survive a price increase from subscriptions at $10/month to $100/month? Probably not. Could Facebook engineer another 10x return on your data? Probably.

So no, you can't subscribe. It wouldn't work.