I develop apps for friends and family, and offer them on the app store for the curious. I have used Pinterest in the past to post screenshots, and a few customers have mentioned they saw it on Pinterest.
Despite the phenomenal FUD, no one ever says they can't find an app they want. They try out the top 5 and pick one. Or make their own if they are industrious.
Huge numbers of shovelware apps aren't really a problem, but realize its time to focus on marketing that mediocre app if you want it to sell better.
The market is dictating the success of all those mediocre app developers properly: relegation to 2nd class and app obscurity.
Its a twitter client, it works, why bother with anything else?