As of today, all Twitter users can have up to 280 characters instead of 140. The first limerick was written with the old limit, the second makes use of the new limit.

OLD

A 140-character tweet/

Is brief, to the point, short and sweet/

280/

May make them more w80/

But not quite so damnably neat.///

NEW

A one-forty-character tweet/

Is brief, to the point, short and sweet/

Two hundred and eighty/

May make them more weighty/

But not quite so damnably neat.///