The hack affected major apps such as Snapchat and Foursquare for less than an hour.

Snapchat apologized Monday after some users reported an increase in "Snap spam" over the weekend, igniting concerns about the company’s recent data breach.

Snapchat says it plans to put out a more secure version of its application following a breach that allowed hackers to collect the usernames and phone numbers of some 4.6 million of its users.