The Big Irish Times Christmas Quiz

The online world51 Uploaded in July, the Korean pop star PSY's Gangnam Style video is now the most liked in the history of YouTube. Of which city is Gangnam a prosperous suburb?

52 In January, which British tabloid became the world’s most popular online newspaper?

53 “Four more years.” With 816,442 retweets, who posted the most popular tweet of all time in the early hours of November 7th?

54 Which social-networking pioneer’s net worth fell $7.2bn (from $19.1bn to $11.9bn) following a disastrous stock market flotation in May?

55 In May, the Twitter hashtag #rathgartortoise trended in Dublin, when a 100-year-old tortoise was reported missing. What was the tortoise’s name? (a) Florentine (b) Sienese (c) Bolognese.

56 In November, which country’s defence forces breached Twitter’s rules on “violence and threats”, when it tweeted a warning that “no Hamas operatives . . . show their faces above ground in the days ahead”?

57 Name the eminent Irish politician who became “internet famous” in August, when a two-year-old radio clip of him berating Tea Party activist Michael Graham went viral in the US.

58 In March, advocacy group Invisible Children vowed to make this African warlord famous with a controversial viral video that received more than 90m hits. What is his name?

59 After 70 years in his post, which superhero announced in October that he is leaving the Daily Planet to set up a blog?

60 A New York Times blogger was hailed as “the lord god of the algorithm” when he successfully called all 50 states in the US presidential election in November. What is his name?

The prize VIP trip for two to Barcelona and winery

The Big Irish Times Christmas Quiz began on Christmas Eve, with 50 questions. Ten more appear today and every publication day between now and January3rd.

The winner of this year's quiz will receive a fantastic weekend for two to Barcelona, including flights and accommodation, a Torres winery tour and tasting, plus two VIP tickets to watch FC Barcelona at Camp Nou stadium.

The Irish Times has teamed up with Torres, the largest European wine brand in Ireland, to offer the trip to visit the winery, which produces, among others, everyday favourites Vina Sol and Sangre de Toro; the new alcohol-free, low-calorie wine Natureo; Ibéricos from Rioja;and the iconic Mas La Plana.

To enter:Fill in the answers to all 100 questions, plus other required details at irishtimes.com/christmasquiz, or

Email the answers to all 100 questions, numbered 1 to 100, with your name, address and telephone number,to christmasquiz@irishtimes.com, or Complete the entry form in The Irish Times on January 3rd.

Closing date is noon on January 11th. Winners will be announced in The Irish Times on January 26th.

Entrants must be over 18. Prizes are nontransferable. The judges' decision is final. Full terms and conditions on irishtimes.com/christmasquiz.