Is it OK to plug a computer into a shared GFCI outlet?
It is OK to have the computer plugged into a GFCI, although it may not be preferable. Hard shutdowns, as would be the case if the GFCI tripped (and the computer's receptacle is actually protected as @keshlam's comment suggests), are not the greatest for computers. You may never trip the GFCI, or may only trip it rarely, and this doesn't become an issue. Or, you may have a very sensitive or failing GFCI which trips regularly, putting unnecessary stress on the computer. If you can plug it in elsewhere, that'd be best, but if not it's not a big deal unless your GFCI trips a lot.