Valerie,
This message was most likely a spam message, meaning that it was a random advertisement. I try to delete all such messages as soon as I notice them, as well as remove the "member" (usually just a computer) from the group. I did not approve this member, and this member is likely not even an actual person, just someone's computer program. If the message has not been deleted, please email me the message number so that I can delete it. Thank you.
Shane