We don't currently have API access to our Social Campaigns product, sending campaigns through our API to Facebook Contacts, posting to Facebook Groups, etc... Some of this functionality is available to users of our UI. All of this functionality would rely on Facebook's API, so you may want to investigate there. It may be possible to develop your own integration that communicates with ours and Facebook's API's to accomplish what you want, if you require a custom option.
Mark Coleman Support Engineer
View API documentation, code samples, get your API key.