Using Facebook People directory you can browse your Facebook friends alphabetically by name. But remember it only includes people who have Facebook Public Search Listings, people who have increased their privacy are out from this list because anyone can opt out of appearing in this directory by changing their Facebook Search Privacy settings.
Using Facebook People Directory is easy:
- Login to your Facebook account.
- Visit Facebook People Directory from here
- Search by typing name in the search box. You can choose from People, Pages and Places as shown in the following image.
Twitter People Directory
Recently Twitter also added the feature of Profiles Directory for browsing public Twitter profiles alphabetically by name so you can do same in Twitter too.