Combine multiple Facebook accounts
Technically, there is no direct quick shot method to merge multiple Facebook accounts. However, you can initiate this by copying your profile content (like photos, notes, etc) and add it manually to your more active account.
You need to manualy build contents from other Facebook account to your active Facebook account as few things like friends and wall posts cannot be transffered. Once you move content to more active Facebook account, you can delete or deactivate other Facebook account.
Please note: if you have created multiple Facebook accounts like one personal account another for your business – then stop it. Facebook provide option to create Fanpages for your business, blogs, websites, celebrity, personalities. You can create multiple Fanpages from existing Facebook account. These fanpages are not linked to your Facebook account from visiting end user.