Such goes a hash tag with which folks have been having a lot of fun on Twitter in recent days. When I saw it, I couldn't help but think of the ninth chapter of the Rule.
"I also admonish and exhort these brothers that, in their preaching, their words be well chosen and chaste, for the instruction and edification of the people, speaking to them of virtues and vices, punishment and glory in a discourse that is brief, because it was in few words that the Lord preached while on earth." (trans. Armstrong and Brady)
140 characters certainly qualifies, and so it would seem that Twitter would be an eminently appropriate means for a Franciscan to preach. It's also a quote you can use on any friar you know who suffers from temptations to prolixity.