[mrstew]

I used to manage mobile products for a large STM publisher. This app is nice - well done getting it off the ground! FWIW I'd stay focused on the core concept (scanning many papers quickly), this is genuinely useful. Nail that first before moving on to other features. I wouldn't worry too much about recommendations: they're very hard to get right in this context, you'd be doing very well if more than one in twenty recommended papers were something useful that the user hasn't already seen.