Source: http://lifehacker.com/5555275/safli-shortens-links-and-scans-them-for-viruses-and-phishing-attacks
You'll never want for a URL shortener with the abundance of them online but why settle for just shortening the link when you can run a security scan on it in the process? Saf.li checks your links to keep them virus free.
Plug a link into Saf.li and not only do you get a shorter link but Saf.li—powered by the popular BitDefender anti-virus software—scans the website to check for viruses, malware, malicious code, and phishing attacks. When it's all clear, our scan took just a few seconds, you get the green light and a shortened URL. When it's not, you get a warning that the link you're trying to share isn't safe.
In addition to security scanning your URLs Saf.li provides click-through stats on your shortened URL broken down by day, week, month, and country of origin as well as referral links and Twitter mentions.
You can create shortened URLs through the main site interface—like the screenshot above—or grab their bookmarklet from the main page of the site for easy one-click shortening. Saf.li is a free service and requires no registration. Have a URL shortening service to share that does more than simple shorten your URL? Let's hear about it in the comments.