Are shorten url make a better in SEO??

Shorten URLs will be used especially at Social Media
sites to share web pages and interesting links. People
are spending hours and hours in front of Facebook,
Twitter etc, so URL Shortener services are increasing
day by day. Most of people have this question that
whether these short URLs are SEO friendly or not.
Usually shorten URLs will redirect to destination
URLs. We need to find out whether these redirections
are permanent (301) or temporary (302). We have few
free tools on the web to check it. Yes, URL Shorten
Services are using permanent 301 redirection which is
search engine friendly.
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