Science 140 … or [subject] 140?

Recently came across Science140, an interesting project using Twitter :

Science140

The idea is that anyone can submit Science definitions of 140 characters or less to the Science 140 Twitter stream.
 
An interesting spin on revision perhaps, but maybe not just from a consumption point of view? Putting a complex (or simple!) idea into 140 characters requires a sound understanding of the principles in the first place, then of course there’s the processing needed to ensure the message gets across without losing its meaning. Perhaps this could be built into a revision programme? Perhaps students might be encouraged to contribute to the live stream?
 
Or how about having the students confirm (or correct) the content of the tweets for clarity/accuracy?  A real test of understanding surely?
 
And whilst this resource centres on Science, how about starting something similar in other subjects? 140 character tweets on different topics in a second language? Tweets arguing the main points from a historical context? Tweets summarising the maind points illustrating a geographical principle? Plenty of scope for all subjects surely?