I checked & verified it with BizFile. I paid S$5 and extracted more information on it.

Registration Number: 201004959C
Company Name: FACEBOOK SINGAPORE PTE. LTD.
Type: LIMITED PRIVATE COMPANY
Description: ADVERTISING SALE
Address: 1 TEMASEK AVENUE, #27-01, MILLENIA TOWER, SINGAPORE (039192)
Paid Up Capital: S$1 (WTF?)

If you google “1 TEMASEK AVENUE, #27-01”, you will notice other companies with the same address as well, so I am guessing this is just a shell and they have yet to set up a proper office in Singapore. With a paid up capital of S$1 from a multi-billion dollar company is also pretty ridiculous.

ACRA Information: Facebook Singapore Pte Ltd

Original Source: Yes, confirmed, Facebook sets up office in Singapore