As far as I can see, if you have a business page, you can only invite people to like your page....if they do so, they become friends. (And yes, inviting people that you think might be interested is important, because your business then appears in their newsfeed whenever you update your business page status). If it is linked to your personal acct., you could request friendship on a personal acct. The only benefit I can see from doing this is if you are consistently sharing business page updates on your personal account. If so, you may get a broader group of people exposed to your business page, but your personal friends might get annoyed.