Via The VR Fund's Tipatat Chennavasin, here's a pretty handy infographic of the virtual reality industry/ecosystem as it exists today:

Notable is the placement of High Fidelity and Project Sansar (which presumably is what Tipatat meant he used the Second Life logo): Square in the "Social" category. However, from what we know of High Fidelity and Sansar, they're not only aiming for the Social market, but also the Distribution market and also the 3D Tools/Engines market. But it's an understandable confusion on Tipatat's part, because thirteen years after launch, the general market still isn't sure what Second Life is supposed to be. And it points to the problem these two would-be successors to Second Life both face: