We have had many complaints from students regarding the removal of the Online Users Block from the Mymoodle page. I hope it will be returned promtly... can't see that it has happened yet:
Online Users Block in My Moodle
Apologies for the online users block being accidentally removed from My home in Moodle 2.4. Mark has come up with a fix for MDL-37414 which will hopefully be integrated in the next week or two.