The 'Internet of Things' can be expected to radically increase the amount of potentially sensitive data gathered in our homes. This study explores the social implications of the presentation of data that could be collected within the household. In particular it focuses on how ambiguities in this data, combined with existing interpersonal relationships, could influence social dynamics. Thirty--five participants were each presented with three separate household scenarios, involving ambiguous data which were collected and presented via near--future Internet of Things technologies. Each participant was asked to respond to a series of open and closed questions about how they would interpret the data, how they would react to it, and their general opinions of the technologies presented. Through qualitative and quantitative analysis of their responses, we contribute an understanding of how people interpret information about those around them. We find a common willingness to make inferences based on ambiguities within the data, even when participants are aware of the limitations of their understanding. We also find that sharing data produced via tagging of everyday objects raises a high level of privacy concern, and that in a somewhat incoherent stance users are more comfortable sharing data publicly than in a targeted fashion with commercial organisations. Our findings also suggest that the age of the target user group has a greater impact on ease of use judgements than the nature of the technology, and we find some evidence that user's interpretations can be biased by an individual's age.