"SoundKey lets you share sounds on Twitter"? I'd focus on the benefits of you service rather than the comparison. Most people probably won't know what TwitPic

"SoundKey lets you share sounds on Twitter"? I'd focus on the benefits of you service rather than the comparison. Most people probably won't know what TwitPic is anyway. For that matter, personally I'd stay away from aligning too my branding closely with Twitter too, although that's certainly a use case I'd support. Maybe: "SoundKey is the easiest way to share [short?] audio [online|on your blog]."?