IKHarvester aims to capture informal learning from social semantic information sources. It harvests data from sources like semantic wikis and blogs using semantic web technologies. The harvested data is provided using learning object metadata standards to support elearning frameworks. IKHarvester has a service oriented architecture with RESTful web services to allow resources and metadata to be retrieved, added, updated and deleted. It is implemented on the notitio.us platform to support collaborative knowledge sharing and aggregation.