It was only in March that I had posted about market share of URL shortening services which was then led by TinyURL. Since then, Twitter changed to Bit.ly as its official URL shortener and the tables have turned since then. Here are the latest market share numbers:

Bit.ly : 79.61%
Tinyurl : 13.75%
is.gd : 2.47%
ow.ly : 2.26%
tr.im : 2.26%
ff.im : 1.92%

PS: The numbers may not be accurate since they are taken from the usage in Twitter.

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