Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

In 2013 Yahoo purchased which pictures and video microblogging website business that was founded in 2007 in New York City by David Karp?
yahoo!

Which Afro American super model, TV personality and singer hosts the TV show, America's Next Top Model and also has her own daytime TV chat show?
america's next top model

Which novelist won the 1993 Booker Prize for his novel 'Paddy Clarke Ha Ha Ha'?

paddy clarke ha ha ha