Certain languages are more conducive to tweeting than others, according to a recent article in The Economist.
Chinese and Japanese are especially useful for micro-blogging due to their inherent brevity relative to other languages. (Twitter is blocked in China.) Those who tweet in Arabic and Korean can also make their micro-posts relatively concise.
Romance languages fare less well: more characters are required to convey a given message. However, shortcuts and abbreviations abound, and English in particular allows its speakers (tweeters?) to drop subject pronouns, abbreviate, and use acronyms freely.
Speaking of Romance languages, check out these English words that we get from French, Italian, and Spanish.