In your TypoScript setup, just change the values for the key "opengraph":
# Opengraph implementation
opengraph {
site_name = Your Site Name
type = article
admins =
email =
phone_number =
fax_number =
latitude =
longitude =
street-address =
locality =
region =
postal-code =
country-name =
}
Those default values comes from the static template of EXT:news