identi.ca是一个基于pump.io软件的开源社交网络和微博客服务，使用活动流协议。

Identi.ca在pump.io上运行，与Facebook和Google+类似，允许发布限定长度的状态更新、富文本和图片。活动流协议支持大多数的活动动态如游戏。OpenFarmGame就是一个基于活动流的游戏。

identi.ca is a free and open source social networking and micro-blogging service based on the pump.io software, using the Activity Streams protocol. Identi.ca stopped accepting new registrations in 2013, but continues to operate alongside several other pump.io-based hosts provided by E14N which continue to accept new registrations.