> In some kind of weird acausal way, because people then anticipated my actions now?

They didn't anticipate _your individual_ actions, but it's highly likely that the persons that bought into Facebook's IPO did expect that they would be able to sell the stock to _someone_ at a later date.

So, yes, people anticipated your actions now (if you look at _your_ actions as the general actions of the crowd, instead of your individual actions)

If you invest in a stock with the intention of selling it later, rather than holding it forever to earn the dividends, your decision was motivated by the expectation that there will be a market for it in the future.

By buying Facebook stock now, you're fulfilling that expectation of earlier investors, which motivated them to provide Facebook's initial funds.

No, you're helping pre-IPO companies raise money now.