0 5 ; ▁Y ahoo ! ▁ 3 6 0 ° ▁in ▁March ▁ 2 0 0 5 ; ▁B eb o ▁in ▁July ▁ 2 0 0 5 ; ▁the ▁text - based ▁service ▁Twitter , ▁in ▁which ▁posts , ▁called ▁" t we ets ", ▁were ▁limited ▁to ▁ 1 4 0 ▁characters , ▁in ▁July ▁ 2 0 0 6 ; ▁T um bl r ▁in ▁February ▁ 2 0 0 7 ; ▁and ▁Google + ▁in ▁July ▁ 2 0 1 1 . ▁ ▁Definition ▁and ▁classification ▁ ▁The ▁variety ▁of ▁evol ving ▁stand - alone ▁and ▁built - in ▁social ▁media ▁services ▁makes ▁it ▁challeng ing ▁to ▁define ▁them . ▁However , ▁market ing ▁and ▁social ▁media ▁exper ts ▁broad ly ▁agree ▁that ▁social ▁media ▁includes ▁the ▁following ▁ 1 3 ▁types ▁of ▁social ▁media : ▁▁ ▁blog s , ▁▁ ▁business ▁networks , ▁▁ ▁collabor ative ▁projects , ▁▁ ▁enter prise ▁social ▁networks , ▁▁ ▁for ums , ▁▁ ▁micro blogs , ▁▁ ▁photo ▁sharing , ▁▁ ▁products / services ▁review , ▁▁ ▁social ▁book mark ing , ▁▁ ▁social ▁g aming , ▁▁ ▁social ▁networks , ▁▁ ▁video ▁sharing , ▁and ▁▁ ▁virtual ▁world s . ▁ ▁The ▁idea ▁that ▁social ▁media ▁are ▁defined ▁simply ▁by ▁their ▁ability ▁to ▁bring ▁people ▁together ▁has ▁been ▁seen ▁as ▁too ▁broad , ▁as ▁this ▁would ▁suggest ▁that ▁fund ament ally ▁different ▁techn ologies ▁like ▁the ▁te legraph ▁and ▁tele phone ▁are ▁also ▁social ▁media . ▁The ▁termin ology ▁is