@
Shellilynne, HTC's naming conventions have been very confusing for a while. Here is an incomplete list of the HTC One models I can remember off the top of my head:
HTC One M9
HTC One M8
HTC One M7
HTC One Mini
HTC One Mini 2 (whoever came up with this name should be slapped upside the head

)
HTC One S
HTC One V
HTC One SV
HTC One X
Pretty ridiculous, eh?
Go to
Settings>About Phone>Model Name/Number and tell us what you see there. I'm going to suggest wiping the cache partition (which doesn't erase any personal data), but it might be important to know which model you have first.
When you say it did an update, do you mean the phone got a system update, or the Facebook app got updated?