An anonymous reader writes: The major automakers have several new technologies to fear, ridesharing services and self-driving technology chief among them. Both of these could dramatically affect how consumers buy cars. So it's perhaps not surprising that after investing $500 million in Lyft, GM has now purchased the assets of Sidecar, a ridesharing service that failed at the end of last year. GM wants to use Sidecar's assets to bolster Lyft — presumably in an attempt to keep Uber from becoming too big. "Sidecar helped introduce the concept of peer-to-peer car-sharing when it launched in 2012 and essentially allowed anyone who passed a background check to offer rides to smartphone-toting passengers." GM will certainly keep the gained knowledge for themselves, as well: "GM is preparing to introduce its own set of transportation services, which it has dubbed Maven, the source familiar with the matter said. The initiative may allow owners of GM vehicles to give rides to other passengers who are commuting in the same direction."