I posted my taxonomy of modes recently. Dave Brook at Carsharing.US has also put up a : Taxonomy of Shared Vehicle New Mobility Options, which stratifies by Scheduled and Spontaneous Trips, Company vs. Privately Owned, and Car Rental, Car Share, and Mobility on Demand.
David Levinson, Transportist 
We would like to praise your work to clear the fog for the average American with your Shared Mobility definitions. I would encourage you to look past the “marketing statements” of vendors like Lyft and Uber as they are not “ridesharing” but instead operate services that defined as vehicles for hire. These vendors have acknowledge themselves with the removal of “donations” and the implementation of taxi pricing models. They are clearly not ridesharing providers as they claim, and will only add additional vehicles to exiting roads.
http://blog.side.cr/2013/11/15/our-move-from-donations-to-payments/
https://www.lyft.me/help?article=1003538
http://www.sfgate.com/technology/article/Lyft-expands-hours-adds-East-Bay-pickups-5100372.php
In September 2012 the California Public Utilities Commission (CPUC) established 28 rules governing a new class of transportation providers referred to as Transportation Network Companies (TNCs);
The CPUC determined that companies such as Lyft, SideCar, and UberX are charter party passenger carriers subject to CPUC jurisdiction. The CPUC created the category of Transportation Network Company (TNC) to apply to companies that provide prearranged transportation services for compensation using an online-enabled application (app) or platform to connect passengers with drivers using their personal vehicles. TNCs do not qualify for the rideshare exemption under PU Code § 5353(h). PU Code § 5353(h) exempts from Commission regulation: Transportation of persons between home and work locations or of persons having a common work-related trip purpose in a vehicle having a seating capacity of 15 passengers or less, including the driver, which are used for the purpose of ridesharing, as defined in Section 522 of the Vehicle Code, when the ridesharing is incidental to another purpose of the driver.
Click to access 77112285.PDF
These vendors are tarnishing the term “ridesharing”, and ask that you start referring to them as TNCs because they are peer-to-peer taxis, that have recently expanded to transport both passengers, and packages, all for a profit to the driver. The services they provide are no different from a taxi or a delivery truck.
Respectfully,
Captain Carpool
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