How to exclude categories from feed in Wordpress

It is very easy to exclude a category from feed in Wordpress, only is agregra the variable cat to our URL of feed, for example in this blog I am going to exclude the Twitter category from the Feed, YOU GO of this category is 98, the URL must be of the following way:

http://www.carlosleopoldo.com/?feed=rss2&cat=-98

If account is to you before YOU GO of is a minus sign -, it is necessary to put it because if we do not do it what estariamos doing it is to show feed unique of category 98 and is the opposite of which we want to obtain.

From now on I have excluded the Twitter category from my Feed, so that those that are subscribed do not receive all twitts of the day.

URL to receive complete my feed with twitts including:
http://www.carlosleopoldo.com/feed

URL to receive twitts unique:
http://www.carlosleopoldo.com/?feed=rss2&cat=98

The URL of feedburner http://feeds.feedburner.com/carlosleopoldo does not include twitts.