Ummmm... You might generate alot of buzz with this question. Some good, most frustrated, and some might just pass you by.
No, currently, this is no information about a FACEBOOK app for the Palm Pre. There is alot of speculation, but, no hard facts. The TV Commercial actually shows something a little different than the x.Facebook site that came preinstalled as an ICON and Bookmark.
Alot of users are using the FACEBOOK.COM site directly with alot of pinch and zoom. The Facebook Chat actually works from within the main site.
The Facebook mobile is not Pre/Iphone optimized and therefore is kind of ... weak?
Just a quick word of advice, make sure you CLEAN up your FACEBOOK and GOOGLE before syncing your contacts. ALL or NONE is the saying here. If you have 300 contacts of nobodys that you do not care for, than you will have 300 nobodys in your Pre Contact. Some do not like this, some do.. Universal search has managed to save some while others just did not like it. (too many contacts)
On the Pre. Hit the contacts icon.
Upper left, hit the Contacts Tab.
Press Preferences & Accounts.
The rest should be self explanatory, if not, let me know, or do what I'm sure many will tell you, 'quick search the forums' as this question was asked a gazillion times. So, hopefully this helps and prevents alot of people from... targeting ya.
Were a testy bunch when it comes to this issue (facebook) :-)