URL Size Matters
Answered => “Twitter force short each link in Tweets, Does t.co / Twitter harms the PageRank of original link?” on Quora.
=> My answer…
No. Or at the very least, doubtful.
A short link it just a proxy to an end point. Keep in mind that Google and it’s search co-conspirators are not stupid. They are well aware of social, shorteners, etc. Their objective is to find, index and SERPs (so to speak) the best content available.Having found that end via a short URL might be signal in Google’s algorithm but it feels doubtful it would carry much weight.
In fact, a t.co shortened URI might actually be better. If Twitter does any sort of pre-shortened checking of the real / full URL then in a way the shortened version says to others, “We checked this out and at the time of shortening there was no spam or other black-listed type site / content on the other end. Else we would not have shortened it.”
Of course a simple redirect could change that but none the less I would not be surprised if some vetting wasn’t being done somewhere. The last thing, Twitter, Facebook and the like want is a reputation for people clicking on links and then getting into malware trouble.