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Ooh that is friendly challenges with no places, that you can participate weekly, a way to have subjects to post on...for example you can find under the hashtags :
MonochromeMonday
TreeTuesday
BeachWednesday
SunThursday
LoveFriday
BeautifulSunday
and a #ColorChallenge with each day a different color to post ;-) check them all, it's very fun to do and you will meet lot of interesting people and pictures ^^
a floweryday1.png @mylifestory ^
^