Seattle-based web-based surveying firm QuestionPro has acquired PollBob, a developer of web and iPhone survey applications. Financial terms of the buy were not disclosed. QuestionPro said the buy will add to its portfolio of research-oriented properties. PollBob has over 350,000 registerd users, according to QuestionPro, and will be expanding the solution with Android and Windows products. QuestionPro provides online survey software.