This is the solution I used, as this problem made me more crazy.
I use Stylish to set up Facebook, and I have a style that blocks all the useless crap on this site, that is, friends' recommendations, ads, unused navigation items on the left, etc.
All I did was find a DIV that contains the entire right sidebar and turned it off. This effectively eliminated the scrollbar and centers the main content in the middle of the DIV.
Here is the line I added to the stylish:
#rightCol {display:none;}
And just for your reference, here is the whole list that I use for Facebook:
.rightColumnWrapper {display:none;} #navHome{display:none;} #pagelet_ego_pane {display:none;} #pagelet_friend_list_suggestions {display:none;} #appsNav {display:none;} #pagelet_ticker {display:none;} #fbSidebarGripper {display:none;} #pagelet_welcome {display:none;} #rightCol {display:none;} .groupMemberSuggestionsList{display:none;} .groupRecommendationsList{display:none;}
Hope this helps if you haven't found a solution yet.
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