Freelancer:
BonusGratis
facebook banner 1
my submission's advantages: 1 using golden scale makes stronger subconscious impression 2 Colors are carefully chosen, attractive but not right of the box; 3 Banner has arrow-like form, it ensures attachment to the app ( unlike #9, which looks like separate app); 4 sizes and position are nicely combined with marking grid of your website ( #39 for example is obviously too); 5 This logo can be stratched during webpage scaling.