1. What do Delicious, Digg, and Furl have in common?
a. They are social bookmarking sites.
b. They are social news sites.
c. They are tag-based sites.
d. Both a and c
e. Both b and c
2. StumbleUpon's Stumble! feature delivers high-quality pages based on:
a. Rankings from your friends and like-minded stumblers
b. Your previous searches
c. Your choice of hundreds of interests
d. Both a and b
e. All of the above
1. c 2. e