Yes. Your trips are as private as you make them! You do have the option to share your trip via social media. However, by doing so the viewer will only be able to see limited information, including the itinerary. No one will be able to search and find your trip.
Be aware that there is a URL to share that allows participants to join the trip. You will only want to share this with potential participants and not share it with anyone else. This URL will be found on the trip invite page.
When it comes to privacy with expenses and other sensitive data, we keep it extremely secure by not storing payment information, which is processed through PCI compliant partners.
If you would like more information, please email firstname.lastname@example.org.