Impossible is an altruism-based social network which invites people to give their services and skills away to help others. Founded by Lily with the support of Kate Tomlinson and Kwame Ferreira, the site allows users to post something they would like to offer or need, creating a culture of giving. In 2013, Lily presented the app's beta in conjunction and with the support of Wikipedia co-founder Jimmy Wales at a special event at Cambridge University. The site has a global membership spanning over 120 countries.
Impossible has since developed a shop selling responsibly sourced products, and a magazine: Impossible to Print.