Might be regional differences in Google results. Quick googling from North America yields the following results about 21.co's initial bitcoin chip design & mining operations[1], and then the pivot to Earn.com "social network tokens"[2][3]; also in Balaji Srinivasan's own words[4].
[1] https://techcrunch.com/2015/05/18/what-is-21-co-really-doing...
[2] https://techcrunch.com/2017/09/20/21-co-announces-a-token-sy...
[3] https://www.coindesk.com/meet-earn-com-21-rebrands-social-ne...
[4] https://medium.com/@balajis/the-turnaround-2d145589d814