As a result, in its latest forecast on shared lodging users, eMarketer has lowered its projections for Airbnb usage. In 2018, Airbnb will have 38.4 million users in the US, up more than 13% over 2017. However, in its last year, we projected Airbnb would have 43.2 million users this year. In fact, we're now expecting Airbnb to add just 6.1 million users in the US by 2021, far fewer than the 17.6 million previously predicted. “Airbnb saw healthy growth in its infancy because it was often more affordable than hotels,” said eMarketer forecasting analyst Jaimie Chung. “However, user growth is plateauing as competition from online travel agents like Expedia and Travelocity grows. Travelers also have lingering concerns about security and privacy following several high-profile incidents.” Get the full story at eMarketer Read also "Airbnb continues to show strong growth. But an IPO is still a long way off" at SharesPost