Microsoft and Facebook - Show me the money

I just watched a video clip by Motley Fool, on Microsoft's rumored investment into Myspace.

Facebook is being valued at dot com pricing ($10 billin dollars). Is there really a revenue model working yet? How many of you have actually spent money while clicking on facebook. Will these sites bestuck now with a complete advertising model to drive revenues? While revenue growth should be linked with member growth, are these sites leaving money on the table by not charging fees?

We can tell that there is a great facebook economy, as individuals collaborate and build relationships within facebook. Facebook, however does not seem to have a way to capture money from those deals or relationships without risking alienating is member base.

LinkedIn,to some extent, has this problem. LinkedIn charges some power users to connect with others, but then also disables accounts for those that reach out to those they don't know well, but may like or need to meet. LinkedIn has driven away much traffic due to a punitive environment.

Once facebook takes on an corporate investor, will we see tiered levels of paid membership? Is this one reason, facebook is moving to an older demographic -- so that business professionals will be more willing to pay to play. If magazines, newspapers and other traditional media are having a hard time sustaining a revenue model, how does facebook get a "pass" on having enough long term viability.

Should Microsoft, Google or Yahoo purchase facebook? what is the penalty on Wall Street for the companies which don't grab a share in this social networking space.

Since MTV networks lost out on purchasing MySpace and pulled content from Google (YouTube) to put on their own Joost platform, are they possible suitors as well to reconnect with their college audience and to connect with the social action website they just announced.

Interesting times!!