▁of ▁these ▁students ▁were ▁found ▁to ▁be ▁" at ▁risk " ▁of ▁social ▁media ▁add iction . ▁Furthermore , ▁this ▁same ▁ 4 . 5 % ▁reported ▁low ▁self - este em ▁and ▁high ▁levels ▁of ▁de press ive ▁sympt oms . ▁ ▁UK ▁research ers ▁used ▁a ▁data ▁set ▁of ▁more ▁than ▁ 8 0 0 ▁million ▁Twitter ▁messages ▁to ▁evaluate ▁how ▁collect ive ▁m ood ▁changes ▁over ▁the ▁course ▁of ▁ 2 4 ▁hours ▁and ▁across ▁the ▁seasons . ▁The ▁research ▁team ▁collected ▁ 8 0 0 ▁million ▁anonymous ▁Twe ets ▁from ▁ 3 3 , 5 7 6 ▁time ▁points ▁over ▁four ▁years , ▁to ▁examine ▁anger ▁and ▁sad ness ▁and ▁compare ▁them ▁with ▁fat igue . ▁The ▁" res earch ▁revealed ▁strong ▁circ ad ian ▁patterns ▁for ▁both ▁positive ▁and ▁negative ▁m ood s . ▁The ▁profiles ▁of ▁anger ▁and ▁fat igue ▁were ▁found ▁remark ably ▁stable ▁across ▁the ▁seasons ▁or ▁between ▁the ▁week days / week end ." ▁The ▁" pos itive ▁emot ions ▁and ▁sad ness ▁showed ▁more ▁vari ability ▁in ▁response ▁to ▁these ▁changing ▁conditions ▁and ▁higher ▁levels ▁of ▁interaction ▁with ▁the ▁on set ▁of ▁sun light ▁expos ure ." ▁ ▁Effect s ▁on ▁youth ▁communication ▁Social ▁media ▁has ▁allowed ▁for ▁mass ▁cultural ▁exchange ▁and ▁inter c ult ural ▁communication . ▁As ▁different ▁cult ures ▁have ▁different ▁value ▁systems , ▁cultural ▁them es , ▁grammar , ▁and ▁world ▁views , ▁they ▁also ▁communicate ▁differently . ▁The ▁emer gence ▁of ▁social ▁media ▁platforms ▁f used ▁together ▁different