Snapchat denied being hacked after some users reported receiving spam messages from their friends advertising a weight loss site.
The ephemeral messaging service told the BBC that it believed that user login data was taken from other sites and used to access Snapchat.
“We recommend using a unique and complex password to access your Snapchat account,” the company told the BBC.
According to the BBC, the spam is sent to all of the contacts on an affected user’s account. Snapchat informs those users of the breach–and recommends that they change their passwords–when they log on.
In January, the company was targeted by hackers who took 4.6 million usernames and phone numbers and released the personal data on the web–with the last two figures of the phone numbers redacted. The hackers said they were raising awareness about Snapchat security concerns.