Eloqua offers Social Sign On with Twitter, Facebook and Linkedin.

 

The following fields are returned from those sites:

 

LinkedinFacebookTwitter
LinkedIn IDNameTwitter Handle
First NameEmailName
Last NameLocationScreen Name
HeadlineGenderLocation
Location NameBirthdayProfile Image URl
IndustryURL
Number of RecommendersFollowers Count
Number of ConnectionsFollowing Counbt
Picture URLLanguage
SpecialitiesVerified
AssociationsDescription
IntestestsTime Zone
HonorsTweet Count
Date of Birth
Address
Company
Company Type
Company Industry
Current Position Title
Current Position Start Date
Current Position Summary
Skills

 

As well, each provider allows you to add custom fields.