We are developing our social and gamification strategy for our next release and we want to track Analytics of each shared link with click through rates. What are the link shorteners we should be utilizing? We have two kinds of links one will be a sharing of a level attained by drinking water in our app, a second is an "activate your health" share which may be shared from your health dashboard with our demographic's top 3 social networks or emailed specifically to "at risk " for diabetes loved ones.
As everyone above suggested, bit.ly is probably the best one available in the market. But I will suggest you to take a look at a new link shortener service called Snip.ly. I started using it very recently and really loving it.
The uniqueness of this link shortener is that you can add 'custom call to action' to each shortened link. Then you can track analytics for both the link and also the 'call to action' engagement. You can give it a try and see whether it serves your purpose.