If the theories in this article are correct you may be finding adverts on Twitter in the not too distant future.
I stumbled across it the other day and it does makes you think about how Twitter could evolve.
It discusses the Pros & Cons of the following ways Twitter could use to generate cash:

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VERSUS
Just as you get used to Twitter, along comes a new kid on the block – Plurk.
You may be wondering like me if Plurk has just got lucky.
Twitter’s recent troubles having left Twitterer’s robbed of their tweet fix’s, seem to have got them diving onto the Plurk wagon to avoid going Cold Turkey.
It [...]

In his latest post on the Thirty Day Challenge blog Ed Dale provides a quick overview of the differences between Friendfeed and Twitter, while battling extreme circumstances.
He mentions that though on the surface they may appear similar, as far as he’s concerned they’re based on different concepts and should be thought of as being completely [...]