Help your potential matches find common interests.
Everything, I got very eclectic tastes!
Here are a few examples:
Music: Bob Dylan, The Beatles, Irish traditional music, jazz, any
live music in general, The Beastie Boys, Beethoven, Bob Marley,
Coldplay, the Nightlab, Okkerville River, The Walkmen, Daft Punk,
Radical Face, Gainsbourg, Many Chao, Edith Piaf, David Gray, The
Killers, Trentmoller, Sigur Ros, Nick Waterhouse, Ray Charles, The
xx, Cat Power, Phantogram, Keane, The SHins, Florence and the
Machine, Mumford & sons, First Aid Kit, Lykke Li, Concrete
Knives, U2 etc.
Movies: Eternal Sunshine of the Spotless mind, Garden State,
Philadelphia, No man's land, Jeux d'enfants, Detachment, Leon
Books: anything by Tahar Ben Jelloun, The little prince, The Da
Vinci Code, Tuesdays with Morrie, 1Q94, Germinal, Concerto à la
mémoire d'un ange, FLE textbooks :-) etc.