The nature of the Internet means that people behave as they please, and not necessarily how they would do in real life. Individuals link being anonymous to being undetectable and therefore they feel as if they are not accountable for their actions online. This is where we start to see the destructive side effects of anonymity come into play.
Around this time last year a large online auction website went public to announce they had been breached and millions of customer records were compromised. They were not alone, 2014 was marked by high-profile cyberattacks to high street and online retailers. Immediately after the attack, most companies asked their customers to change their passwords, either as a security fix or as a precaution, but is it enough?
As a parting thought, check also to see if the web site provider offers a two-step verification method to protect your account details (e.g. requiring an additional one-time passcode, send via SMS to your mobile phone, in order to modify your account settings). This will further secure your account.