The "Singapore Airline 45th Anniversary Free Ticket" giveaway below is a scam. After charging you $1 on your credit card, it sign you into the website ebooki.cc or thepolo.cc, which is fraudulent and will charge you a monthly fee of $49.95. Furthermore, your information may also be fraudulently used by other third party, so you may have to cancel your credit card and get a new one to stop continuous fraudulent charges.
The "Singapore Airline 45th Anniversary Free Ticket" Scam

Singapore Airlines offers 2 tickets to EVERYONE for ONLY $1! To celebrate its 45th anniversary.
Singaporeairlines.com--fly.co
Singapore Airlines offers 2 tickets to EVERYONE for ONLY $1! To celebrate its 45th anniversary.
Remember, if you have given your credit card details and other personal information, they will be compromised and you have blocked your credit card and raise a dispute over the amount charged to the credit card. Then you may need to cancel the credit card and get a new one.