Invite friends. According to relevant information, if you want to get the invitation code, you can only invite friends who have not joined the 5 1 community and share them with them. 5 1 Committed to providing users with stable and safe data storage space and convenient communication platform. Registering as a user can not only publish photos, diaries, music and so on conveniently, but also share these data with friends conveniently. By the end of 65438+February 2009, registered users had exceeded 65438+78 million, monthly independent users had exceeded 40 million, and daily average PV had exceeded 440 million. 5 1 official website is jointly invested by internationally renowned enterprises such as SequoiaCapitalChina, GiantInteractiveGroup, SusquehannaInternationalGroup, IntelCapital, RedpointVentures and venture capital funds.