At the JFBConnect backend, i set "Always import Profile data" to "YES".
I noticed that everytime a user logs in to my Joomla website via JFBConnect, a new avatar image file is created for that user by Jomsocial, with a different random filename. So if the user logs-in 3 times for that day, a total of 3 identical avatars are created, each having a different randomized filename.
If the same user logs-in 3 times a day for 5 days in a row, a total of 15 completely identical avatars are created for that user! Imagine if i have 200 users who log in multiple times a day! Identical avatars get multiplied! I already disabled the Jomsocial Facebook plugin. Only JFBConnect is working. I'm not sure why Jomsocial is treating every avatar retrieval from Facebook via JFBConnect, as a new image saved on the disk every time.