SMS text message notifications from 32665 is not a scam. If you've set up Facebook texts, you can use 32665 (FBOOK) to get notifications without using mobile data. Keep in mind that standard messaging rates apply. You may need to use a different code from 32655 (FBOOK), depending on your country and carrier.
If you want to stop receiving notifications from 32665, you can send "STOP" in a SMS text message to 32665.
A 32665 Facebook SMS Notification
From: 32665 Text: X is your Facebook password reset code. Reply "stop", or go to https://fb.me/XXX to turn off SMS messages for your Facebook account on this mobile number.