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There isn't a winner when comparing expanding foam versus concrete for fence posts. Both have benefits and drawbacks, depending on your budget and priorities. Expanding foam may be a better choice if you want a more eco-friendly solution that cures faster. Concrete is more affordable and durable than expanding foam, yet it is harder to work with and takes longer to cure. 

A properly installed 6-inch concrete slab, mixed and cured under the right conditions, can support about 3,000 pounds concentrated over a single square foot without buckling. Conversely, concrete pavers can handle around 8,000 pounds per square inch when laid over a solid, well-compacted base.

Yes, you can screw directly into concrete, but only if you use screws specifically made for masonry or concrete. They're often labeled as masonry screws and made of steel and a special thread that provides a strong grip. However, even when using these screws, drilling a pilot hole first will make it much easier. 

A floating concrete slab is considered a footing since it distributes the weight of the structure to the soil, but not all concrete slabs are considered footings. For example, a T-shaped slab includes separate footings below the slab that support the concrete above and push the load further down into the ground. In that case, the slab would not be considered a footing.