In a move that will simplify life for some (and maybe confuse others) Facebook is allowing individual profiles to become business Pages. This may be targeting the potentially millions of SMBs and sole proprietors that have profiles but not formal fan Pages.
All existing Friends automatically become Fans of a converted profile.
It’s very difficult to know precisely how many SMBs are on Facebook. The number is probably between 3 million at the low end and 5 million today. This is based on extrapolating from various surveys.
Most of these SMBs “on Facebook” probably don’t have formal Pages but have individual profiles instead. As mentioned, this conversion process is probably directed primarily toward them.