The 140 characters of a Tweet have served users well to date. This week Twitter surpassed the 10-billion-Tweet mark.

But from the outset there has been frustration that it's just not enough room to express --- and, for some, express in such a way as to monetize.

Now Cascaad has come along with an API that it says will permit third-party Twitter applications to add context and monetization to the mix. ReadWriteWeb has had a look at the plan, and without blessing it, largely believes it's on to something.

Cascaad's API lets someone parse a Tweet, focus in on entities within it and contextualize (or link to monetizing services, it seems) them. Twitter has been promising for months now services that would help users --- and themselves --- use the platform to make money.