I carried out a simple experiment: grab a good chunk of Twitter data; pull out all the URLs, rank the domains and then track the trends in Compete.com. Below is the head of the list.
| Rank | Domain | Monthly Growth | People |
| 1 | tinyurl.com | 21.6% | 4.5M |
| 2 | bit.ly | 48.8% | 1.2M |
| 3 | twitpic.com | 54.6% | 2.4M |
| 4 | is.gd | 21.8% | 0.7M |
| 5 | ff.im | 25.5% | 0.2M |
| 6 | twurl.nl | 29.4% | 0.3M |
| 7 | ow.ly | 85.3% | 0.6M |
| 8 | blip.fm | 18.3% | 0.3M |
| 9 | tumblr.com | 14.8% | 2.3M |
| 10 | plurk.com | 19.9% | 0.3M |
| 11 | tr.im | 63.0% | 0.4M |
| 12 | cli.gs | 38.7% | 0.3M |
The data seems conclusive: cli.gs is definitely the URL shortening service with the weirdest name
