Earlier rumors indicated the social media giant was researching blockchain.
Now it looks like that's for a payment system.
Source: https://www.cnet.com/news/facebook-reportedly-looking-to-get-into-cryptocurrency/
Facebook certainly doesn't need to raise money through an ICO for development. Evn if Facebook does issue a cryptocurrency, it would be the equivalent of fiat on Facebook and would probably be spendable only for Facebook advertisements. Who would be interested in buying a currency like that?
we take a positive attitude that facebook receive crypto so there will be a positive value on facebook that can lift bitcoin value and maybe ICO ads will be allowed back
There is a big chance that Facebook marketologists scan potential market, trowing out such news.