gRegorLikes don't need a `p-name`. A minimal like is an h-entry with the u-like-of property. Wrapping it in a p-summary is a good practice though, so consumers can fall back to showing that plain text if they don't understand u-like-of.
gRegorThere are some implied parsing rules, like if there's no other p-* or e-* properties, the `name` will be implied as the text contents of the h-entry. That might work OK if there's no additional text inside the h-entry, but often leads to unexpected results, like additional text getting into that implied name. That's another good reason to have an explicit p-summary property