do URL shorteners pass link juice?

Yes. But they need to be 'proper' 301's...

This article offers some useful insights:

http://searchengineland.com/analysis-which-url-shortening-service-should-you-use-17204
 
So, which url shorteners do 301?

Did you read the article above? It has a grid which shows which redirects use 301's.

You also need to consider a URL shortening service that is well established; you don't want to spend a year building shortened URL's and find they've closed up shop!

I generally stick to bit.ly; well established, well funded, and with good tracking features.
 
Yeah Bit.ly does have great tracking analysis but I view them as far from stable. Clickbank links are often rendered useless and the fact that they have a .ly extension makes them far from safe. They use the same links often and stats are skewed as a result. Personally I use Ttwi.st . It's a premium URL shortener which costs $5 a month but it is designed for IM'ers, allows Clickbank links, has tracking and an API. Further developments are also coming.
 
I'm trying to find a good link shortener that does not pass link juice. I want to use it for forum sigs and other places I really don't need a bunch of sh*tty backlinks from. Preferably one that provides statistics. Any good ones?
 
I'm trying to find a good link shortener that does not pass link juice. I want to use it for forum sigs and other places I really don't need a bunch of sh*tty backlinks from. Preferably one that provides statistics. Any good ones?

Can't you just block bots via robot.txt on your URL shortener domain?
 
That's what I ended up doing. Using my own domain and just having it do a redirect.
 
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