lets fix the reasons why you aren't still engaged. Because no one is using it.

I bet with some marketing you'd be 100% all over it.

Here's how you do it - man, its so easy to market your app. Do this:

a) get a better catchier name. One that can be tweet'd as "Cool, just got listed on x"

b) go thru the most influential twitter names and group them in cool ego-massaging groups. Not celebrities, you can't reach them. Smaller than that. Go for the @ryancarson style people. Create flattering groups, then tweet all the people in said groups and make it sound awesome that they're included in such an elite list, beg them for a retweet of your link.

c) allow users to submit users to groups on your service. So I can tweet your service "@tweettop @plc #founders" and it'll add @plc to the #founders group on your site. Awesome. People can RT that tweet to support it.

Then you're pretty much made - the crowds will decide if your app is useful. If it isn't its kind of pointless in general...