You must understand that as a newbie blogger, you shouldn’t make your news the same length with what CNN and BBC publish. People will not have the time to read all that. If they will have the time, they may prefer to visit the original source of the news to read first-hand material.
Try as much as you can to read and summarize before posting. Short posts will be more useful unless you are writing a useful article. But if you are reporting breaking news, make it short and straight to the point.
The only time you need to give an explanation is when this happens: