This article argues for potential. But for Twitter to be as high-valued as Facebook, it has to prove it can be adopted by average internet users. Twitter has such a potential, yet Facebook has already been achieved that.

When I recommend Twitter to my friends, it usually goes like this:

Me: Try Twitter, it is interesting. Friend: What can you get from it? Me: a lot of interesting updates from your favorite people and topics Friend: I already have enough internet updates. I shall pass...

The point is that average user only has several web sites on their minds. There much be a good reason for them to use one more web site.