▁first ▁F 8 ▁event ▁was ▁held ▁on ▁May ▁ 2 4 , ▁ 2 0 0 7 , ▁at ▁the ▁San ▁Francisco ▁Design ▁Center ▁in ▁San ▁Francisco . ▁The ▁notion ▁of ▁the ▁social ▁graph ▁was ▁introduced . ▁▁ 2 0 0 8 ▁The ▁ 2 0 0 8 ▁F 8 ▁event ▁was ▁held ▁July ▁ 2 3 , ▁ 2 0 0 8 , ▁at ▁the ▁San ▁Francisco ▁Design ▁Center ▁once ▁again . ▁News ▁and ▁announ c ements ▁from ▁this ▁event ▁included : ▁▁ ▁Int rodu cing ▁the ▁New ▁Facebook ▁Profile ▁& ▁More ▁ ▁Integr ating ▁Facebook ▁Connect ▁into ▁your ▁Website ▁▁ 2 0 1 0 ▁The ▁ 2 0 1 0 ▁F 8 ▁event ▁was ▁held ▁April ▁ 2 1 , ▁ 2 0 1 0 ▁at ▁the ▁San ▁Francisco ▁Design ▁Center . ▁The ▁main ▁announ cement ▁was ▁the ▁feature ▁to ▁add ▁a ▁“ Like ” ▁button ▁to ▁any ▁piece ▁of ▁content ▁on ▁a ▁website ▁by ▁the ▁owner . ▁This ▁feature ▁is ▁now ▁integrated ▁within ▁around ▁ 2 . 5 ▁million ▁websites ▁world wide , ▁with ▁ 1 0 , 0 0 0 ▁more ▁being ▁added ▁daily . ▁ ▁Add itional ▁news ▁and ▁announ c ements ▁included : ▁▁ ▁Social ▁Pl ugins ▁( e . g . ▁Like ▁button ) ▁ ▁Open ▁Graph ▁Pro tocol ▁ ▁Graph ▁API ▁ ▁O Auth ▁ 2 . 0 ▁▁ 2 0 1 1 ▁F 8 ▁ 2 0 1 1 ▁was ▁held ▁on ▁September ▁ 2 2 , ▁ 2 0 1 1 . ▁Vari