how do I send recent posts to twitter feed automatically

I have a couple of twitterfeeds and would like my wordpress blogs recent 5 posts to be sent to twitterfeeds automatically. also face book. I have two forums and I can feed the 5 most recent posts to my twitter feeds. But can’t do it with my wordpress blogs. I use Linux and I use sage for a feed or rss reader. When I copy a rss feed link from my blog and insert it in twitter feed it will not parse. any help would be appreciated.
M H