Campaign tools | A-twitter | Economist.com Twitter imposes a 140-character-limit on all tweets. The choice is technical, not aesthetic; most mobile-service providers won’t carry text messages longer than 160 characters. This limit, as with any restricted poetic form, is a strength. Foreign correspondents in the first half of the 20th century learned to write in cablese, a series of abbreviations demanded by news organisations that had to pay by the word.