Please beware of potential scams or fraudulent claims. Once bitcoin is sent, that transaction cannot be reversed or refunded in any way.
There are three main ways people get scammed:
1. Job opportunities: Victims are contacted via email or phone, or victims respond to a job posting found online. They are then electronically transferred large sums of money to their bank account and are asked to withdraw the cash and use it to purchase bitcoin as part of an employment application process.
The thieves generally offer a reward of $50-$100 for the victim's assistance. A few days later the money sent via the electronic transfer is linked to a stolen bank account and the transfer is reversed, leaving the victim with a negative balance and no bitcoins.
Source: Krebs on Security Article
2. Airbnb Scam. A popular new scam is conducted by operators of a fake Airbnb website. These scammers will post fake listings on the real Airbnb website. When contacted, they will direct victims to a clone website that looks the same, but is not legitimate. This clone website will direct victims to make a deposit via Bitcoin to hold their desired lodging. Often times victims show up to their supposed Airbnb lodging the day of their intended stay and are met with the bad news. Airbnb does not accept bitcoin in any form right now.
3. Another way people are scammed is over some 'too good to be true' cheap offering, e.g. a used car listing on craigslist or ebay at a price 2 times lower than the market value.
The person is then asked to make a bitcoin payment to the given QR code. After bitcoins are sent, the seller disappears leaving the victim with neither the funds nor the goods "purchased".