Long news or short news?
Blogging styles are different one from the other: there are bloggers out there that write a lot, others that write a few lines for every news.
On this blog I try to be synthetic, but not too much: this is a personal choice, but avoiding to write flows of words is usually a tip valid for all kind of readers.
But as usual, this depends on which kind of content you are dealing with, and which is your public. The only rule is: choose a style, and stick to this, since coherence is far more important than any other disquisition about the lenght of the posts.
