If you're just getting started to use bitly in DataSift, here's some recommended reading.
Bitly, DataSift and Links Resolution Blog
Read this excellent blog from Lorenzo Alberton, DataSift's Chief Technical Architect, describing the bitly data source and the Links augmentation 'under the hood'.
Bitly & Metadata Blog
This blog looks at DataSift's latest link resolution services, including a new partnership with bitly, the #1 link sharing platform, which powers 75 percent of the world’s largest media companies and half of the Fortune 500 companies. With over 20,000 white-labeled domains, bitly generates at least 200M clicks/day.
The custom CNAME of the decoded URL if available.
Name of the country for the IP address of the client.
2-character ISO code of the IP address of the client (ISO 3166-1 code).
The domain of an original link.
Latitude and longitude of the IP address of the client.
The city name for the IP address from which a user clicks a bitly link.
The geographical region of the IP address of the client.
The geographical region code of the IP address of the client.
The domain of the referring URL, when available.
The HTTP Referrer header as sent by the client.
A user-specific hash for the global bitly hash.
The timezone of the IP address of the client.
The URL the global bit.ly hash redirects to.
The bitly hash for a unique URL.
The HTTP user agent string sent by the requesting browser.