You can easily do this by inserting your own mimetype type:
Builder builder = ContentProviderOperation.newInsert(ContactsContract.Data.CONTENT_URI)
.withValueBackReference(ContactsContract.Data.RAW_CONTACT_ID,0)
.withValue(ContactsContract.Data.MIMETYPE,"vnd.android.cursor.item/facebook")
.withValue("data1","bkhashfehFacebookId")
And then you can easily read your own data from your own application using the (query) method, and you will pass mimetype to your search criteria.
, , mimtype .