Always consult the Owners Manuals and FAQs first.
FM3 information is being added as it becomes available, but it's preliminary and not final until release
Axe-Change is Fractal Audio's website for sharing presets, cabs and effects settings. Upload your own creations or download those made available by others.
Axe-Change is accessible from within the software editors.
Fractal Audio's user forum is another source for shared presets, cabs and effect blocks.