Top 20 : Known but unknown facts ;) :p

1. The dates 4/4, 6/6, 8/8, 10/10 and 12/12, all fall on the same day of the week during any one year.
2. Angel Falls, the world’s highest waterfall, is so high that much of the water evaporates before it can reach the ground!!
   
3. A Chinese man sued his wife for delivering an "extremely ugly" baby and won the case.
4. Not so weird, but...111,111,111 x 111,111,111 = 12345678987654321
5. Honey is the only food item which never rots. A jar of honey can remain edible for 3000 years
6. 2013 is the first year since 1987 that consists for four different digits.
7. You can not fold a sheet of paper more than 7 times into equal halves. (even a sheet as thin as that of a newspaper)
8. Entering 241543903 in Google Images gives a weird amount of images of people with their heads in their refrigerators!
9. Google is the only website in the world with the goal of reducing the time spent by the user on their website.
10. 399999999999999 - 399999999999998 = 0 on Google. If you dont believe it.. just try it for yourself.
11. India Post allows you to order personalized stamps with your picture on them.
12. India has the world's smallest prison population
13. There Is A Starbucks Cup Visible In Every Scene In Fight Club. I’m not kidding. In every scene in Fight Club, there’s a Starbucks coffee cup hidden somewhere – you just have to be bothered to look.
14. The flag of Paraguay is the only national flag in the world that's different in the front and in the back.
15. It rains diamonds on Saturn, Jupiter and Neptune.
16.  In a deck of cards, The King of Hearts does not have a mustache.
17. "I am". It is the shortest complete sentence in the english language.
18. A Snail can sleep for 3 years.
19. The names of the continents all end with the same letter with which they start
20. It is impossible to sneeze with eyes open.

For Facebook's interesting fact, click on the below link!!
http://hangout4fun.blogspot.com/2014/07/facebooks-unknown-fact.html