I still find bit.ly links in posts every so often. With all the social networks no longer counting the actual length of a URL against a post's character count, and with all the security implications of URL shorteners, why is this still a thing? Yes, there are a few other shorteners, too, but bit.ly seems to be the most common.
It could also be someone still using paid for bit.ly for their tracking purposes (which link used to access the site to determine which promotion methods are successful) rather than having them created on the server side (the whole ?=RSS in the url for example to tell the webmaster that 30 people accessed his page by using the link in the RSS Feed)