21) How much did Facebook pay for the acquisition of WhatsApp in 2014?
22) What was the first version of Facebook called that was released in 2004?
23) What was the first company to invest in Facebook, leading a $7 million investment in 2005?
24) What type of mobile application was first developed by Facebook in 2008?
25) In which country is Facebook's headquarters located?
26) What feature did Facebook introduce in 2009 to allow users to connect with their friends?
27) In what year did Facebook launch its Live Video service?
28) In 2014, what messaging service did Facebook buy for $19 billion USD?