The #100HappyDays challenge is an international social media experiment that is challenging people to be happy every day for 100 days.
According to the 100happydays.com website, a majority of people don't have the time to be happy every day.

The challenge is to post a picture on Facebook, Twitter, or Instagram of what made people happy every single day for 100 days using the hashtag #100HappyDays.

According to the site, the challenge puts people in a better mood every day, makes them more optimistic and has even helped some to fall in love.

Here are 39 things that made people happy every day in the #100HappyDays challenge:
1. Nostalgia
Day 2: Cycle parking lot of the best school where i studied :D #Nostalgia #100happydays
Ravi Shankar V R
@PurposelessSoul
Day 2: Cycle parking lot of the best school where i studied :D #Nostalgia #100happydays
2. Coconut water + glitter
Drinking Coconut Water inbetween glitter layers! This stuff is amazing! #100happydays
Hannah Levane
@HannahLeMade
Drinking Coconut Water inbetween glitter layers! This stuff is amazing! #100happydays
3. Books
4. Letters from friends
Letters from chums. #100happydays
Helen
@HelenMoyes
Letters from chums. #100happydays
5. Presents
Day 2: Received gifts from Santa in college today. Fortunate to have a Santa who knows me so well #100happydays
Nivedita
@niveditav_
Day 2: Received gifts from Santa in college today. Fortunate to have a Santa who knows me so well í ½í¸„ #100happydays
6. Harry Potter
Day 1. #100happydays Because little things like this make me happy. #HPFangirlForLife
DBM
@MsMecheri
Day 1. #100happydays Because little things like this make me happy. #HPFangirlForLife
7. Dogs
Day 1 - Well here's the first thing that makes me happy every day, the cuddly Spice! #100happydays
Uditvanu Das
@primaveron
Day 1 - Well here's the first thing that makes me happy every day, the cuddly Spice! #100happydays
Waking up to smiles and joy #100HappyDays
Aditi
@Aditi_RR
Waking up to smiles and joy #100HappyDays
Taking naps with my Reese ❤️ #100happydays
Emily
@Emmm321
Taking naps with my Reese â¤ï¸ #100happydays

8. More dogs
9. SO MANY DOGS!
10. And cats.
The joy of an afternoon nap. Added bonus -- Fluffybum decided to join me - on me! Day 2 -- #100happydays
Divya Vijay Pratheek
@meowiyer
The joy of an afternoon nap. Added bonus -- Fluffybum decided to join me - on me!
Day 2 -- #100happydays
11. Candle-lit bubble baths
12. Companionship
Attended our first wedding together. #100happydays #day1
★
@JazzLikeThis
Attended our first wedding together. #100happydays #day1
13. Being a couch potato.
#100happydays #day2 watching the wonderful Billy Elliott
Gaelle Pasteur
@gaellepasteur
#100happydays #day2 watching the wonderful Billy Elliott
#100happydays start with Dr House :) day 1
Junglee Billee
@paratripper
#100happydays start with Dr House :) day 1
14. Awesome roommates
15. Learning to ski
#100happydays day 1 the slopes made me happy today gonna be a pro skier in no time! :) lesson 2 booked tomoz! :))
Stephen Kay
@sarmourkay
#100happydays day 1 the slopes made me happy today gonna be a pro skier in no time! :) lesson 2 booked tomoz! :))
16. Booze
Happiness can be bottled. @kingfisherworld #100HappyDays
Bunty Chellani
@chindisindhi
Happiness can be bottled. @kingfisherworld #100HappyDays
17. Ikea
18. Team spirit
9 yrs of workin 2gether. 4 yrs of r own agency. He says I'm his role model in many ways. I say ditto. #100happydays
agentgreenglass
@agentgreenglass
9 yrs of workin 2gether. 4 yrs of r own agency. He says I'm his role model in many ways. I say ditto. #100happydays
19. Food
The first.... #100happydays fresh seabass I brought from the market about to go into the oven YUM
Zoë Doano
@zoedoano
The first.... #100happydays fresh seabass I brought from the market about to go into the oven YUM
Day 1: Eating suji golgappas, samosa and jalebi before i leave from Delhi.. Things i miss in Bombay #100happydays
Tania Suri
@taniasuri
Day 1: Eating suji golgappas, samosa and jalebi before i leave from Delhi.. Things i miss in Bombay #100happydays
Having a full packet of Oreo biscuit *yum* #100HAPPYDAYS #oreotime :D
Neha Chawla
@chawlaneha21
Having a full packet of Oreo biscuit *yum*
#100HAPPYDAYS #oreotime :D
20. The return of Sherlock
#100happydays Day 1: Sherlock returns :D
Sean D'mello
@SeanDmello
#100happydays Day 1: Sherlock returns :D
1 of #100happydays #Sherlock did it for me.
Ketki Lonare
@ecsoNtemet
1 of #100happydays
#Sherlock did it for me.
#Day1 #100happydays Chilly weather..#Sherlock new episode..yummy groundnuts...and the beginning of a weekend. #TGIF
Purnima Joshi
@purnima30
#Day1 #100happydays Chilly weather..#Sherlock new episode..yummy groundnuts...and the beginning of a weekend. #TGIF
Let's do this! Wore my new 'I am Sherlocked' Tshirt to celebrate Season 3 . WEE! #Day1 #100happydays #Sherlock
Pallavi
@Speakmymind03
Let's do this! Wore my new 'I am Sherlocked' Tshirt to celebrate Season 3 . WEE! #Day1 #100happydays #Sherlock
21. Costume parties
22. Cleaning
23. Happy feet
24. Faith
25. Science
26. Friends
#100happydays #day2 best friends desperation for us to find love. @JessicaLowerxo
Beka
@Bekahshorrock
#100happydays #day2 best friends desperation for us to find love. @JessicaLowerxo
27. Sunsets
28. Family
Happiness is simply being a Daddy's girl #100happydays
A gal passed by...
@smilesgalore
Happiness is simply being a Daddy's girl #100happydays
29. Feeling happy for others.
30. A new hair do.
31. Hair in general.
32. Writing
33. Fandom
34. Starbucks
35. Disney
#100happydays watching Disney movies makes me happy as does every I get tweet from @HannahLeMade :3
Molly Hooper
@StarkidHobbit
#100happydays watching Disney movies makes me happy as does every I get tweet from @HannahLeMade :3