所有游戏开发商都应让玩家得以在消息动态或Twitter中发布最高分数或者重大成就。这样一来，游戏就能够推广至玩家好友当中，获得新用户（游戏邦注：例如在Zynga游戏《Texas Hold’Em Poker》中，玩家能够在获得三张相同的牌（Three of a Kind）、Flush或一手好牌时分享给好友）。
用户愿意邀请好友，开发商应把邀请好友变成更富吸引力，更便于操作。Serious Business（游戏邦注：该公司已被Zynga收购）首席执行官Siqi Chen曾在分析报告中表示，用户每次习惯邀请16名好友，也就是Facebook好友选择工具的邀请上限。游戏开发商可以通过提供邀请奖励更充分利用这个策略。例如《Green Planet》游戏通过给予玩家更多金钱奖励，换得更大“Green Team”，鼓励玩家邀请好友。他们还向玩家推荐添加内容。
Top 5 Elements for Virality of Social Games
For today’s social game developer, virality is key to driving user growth and lowering customer acquisition costs. Here’s a look at five elements that boost the virality of social games:
1. Publishing updates about the game through users
Every game developer should allow users to publish their top scores or milestones on their news feeds and Twitter streams. By doing so, their games will be promoted to all of their users’ friends and likely attract new players. For example, Zynga’s Texas Hold‘Em Poker lets its players announce to all of their friends when they get Three of a Kind, a Flush or another great hand.
2. Embedding social interaction into the game
Game developers can boost virality by promoting direct user interaction—which transforms the gaming experience into a chance for players to spend time with (and recruit) their real-life friends. A few good examples include Playfish’s Restaurant City, which lets players hire their own friends to work in their restaurants, and Lexulous (pictured below), which requires players to choose their own friends as opponents.
3. Building fan bases outside of the game
Fan pages and forums are great ways for social game developers to increase awareness of their games, develop more affinity in their players and make users more willing to promote their games. Game developers can drive even more traffic to their fan pages or forums by promoting it within their games. By making it a part of the in-game mechanics, it will seem less like an advertisement and encourage more users to become fans.
4. Creating incentives for inviting friends
Users are wiling to invite their friends, and game developers should make it compelling and easy for them to do so. In a recent analysis, Siqi Chen of Serious Business showed that users tend to invite 16 friends at a time—the same number that Facebook allows on its friend selector widget. Game developers can make even better use of this tactic by offering incentives to recruit other users. For example, Green Planet encourages its users to recruit their friends by letting users earn more money by having a bigger “Green Team.” And they even recommend friends that the user should add, as pictured below.
5. Designing a game that is naturally fun to play
Virality is an essential element for user growth, but unless the game is worth sharing, viral tactics won’t do any good. If a game isn’t fun to play, users won’t play. And they certainly won’t promote it to their friends. As Sebastien de Halleux, COO of Playfish, said at the Social Gaming Summit 2009, the key metric for a successful game is fun. At Playfish, they know a game is ready to launch when the entire company can’t stop playing it.（Source：trialpay）