The homepage is rather terrible at explaining the product. The two clearest explanations on the page are in the smallest and most illegible type.

"@bubbles is a fast, cool and easy way to write authentic letters. Put hand-written signature, draw, sketch, paint, write or collage on your letters and mail it to anyone."

"@bubbles lets you write authentic letters straight from your browser. Add pictures, draw, type, paint, sketch or collage just like on real paper – it's as easy as pie."

I'd skip the "fast," "cool," "easy," "easy as pie" explanations and keep it as honest and succinct as possible.

In fact, your enterprise page does a decent job of explaining the product, especially since you have a video explanation, but I'm still not sure if you're a social network, email 2.0, a paper distributor, or a tshirt printer.