I deleted them... and the only time they re-appear is if you get your service books resent. They were gone from my phone for 2.5 weeks... After doing a wipe they came back, so I deleted them again... so far they're gone again (it's only been a day though)
If you go to options - Advanced options - service book
You should see something along the lines of Virtual_Preload_Facebook and Virtual Preload Handango. If you highlight them and then delete, they go away.
Like I said, if you ever re-send service books, they come back. But other than in that situation I haven't seen them come back