PLEASE READ THIS EVERYONE.
A text message can only have 140 characters in it. No more. If you want to turn the fragments into tweets, they need to be no more than 140 characters. Thus, REAL blogs have to be 141. I don’t know why Vusys hasn’t made this clear yet.
A quick Google: 
http://latimesblogs.latimes.com/technology/2009/05/invented-text-messaging.html
160. Twitter/whatever reserves 20 bytes for headers/whatnot.
But why does that matter? For the site’s purposes it’s pretty arbitrary, unless you’re planning to let people text VuTales to post their fragments.
-.- @ Cheeze
What I mean to say is that just because anything under 140 characters can go in a fragment instead, doesn’t mean that it should go in a fragment. In certain situations it may be more suitable for a blog, although, granted, 140 characters is extremely short.
In reality if someone wants to spam, they will spam. They’d use 141 @’s or whatever. And if someone really wants to post a short blog, they’ll sandwich in a lot of whitespace.
You could argue that it might make people think twice about it before doing such a thing, but you can accomplish that that without enforcing a stringent limit. Direct people to a rules page on sign-up. Display a word count, which is already done. If you even want to, make an “Are you sure you want to post such a short blog?” alert box. But setting automatic limits only encourages people to bypass it if it gets in their way, which I think is really counter-productive.
Ha, seems like you’re right. I knew it was some number between one and a hundred with an even tens digit…
The point is not to text VuTales fragments, but to enable people to receive the tweets (on their phone) when you post them. For example, Cheeze posts a fragment: “I just beat AznSeal at SSBM!” I get said fragment sent to my phone. I get updates without even coming online. That’s the point.