Systems and methods for providing online promotions integrated with social network-based platforms are disclosed. Promotion details such as rules, offered prizes, incentives and descriptions, survey questions, display banners, terms and conditions, privacy policy, and social networks to integrate the promotion with, are provided by the sponsoring organization to a server. The server generates a custom promotion application or widget for integrating with the organization's social network webpage external to social networks. A participant enters the promotion through these webpages or other links and lists friends in the social network to receive an invitation to enter the promotion. Viral features such as friend invite features, newsfeeds, minifeeds, other features that display online activities of users and people in the users' social network, notifications, requests, and other social media-based platform features to deliver messages to members of the one or more social networks further spread the word about the organization's promotion.