The 'square' ones (56,57,78,80) aren't appropriate for us because we need to manage the space available above the fold on the website - a square logo pushes all the content down and leaves a lot of unused white space.
The 'pocketbook' would be too small in those examples to come through.
The landscape logo #79 is more useful, but we think the icon lacks contrast, which means it would be difficult for consumers to resolve quickly - this would make the logo less effective.