Facebook was called TheFacebook at the beginning.
Why it is true
When it was launched in 2004 by Mark Zuckerberg and Harvard colleagues, the site was called TheFacebook. In 2005, the company bought the domain facebook.com for 200,000 dollars and officially adopted the name Facebook.
Source: Facebook
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.