Arrange the chairs in two or more lines so the students sit facing one other person. If possible put a line of tables in between to make the setup more realistic. Depending on how well your students know each other and your target language , they can either use their real identities or invent a person to play. Students can either keep their own card, or to make things more interesting, put all the cards in a hat and draw a random person. If students used invented people, they can give their impressions of personality, and see if the adjectives they use match what was written on the card. Plus, they can say who they think is the best match for them as a friend, based on hobbies, personality, likes and dislikes. If you wish, they could also do the above as a written activity, as a message to a friend describing how the speed dating went.