Listen, I get it. I used your app. Yay! I even like it. So, maybe my friends will like it too? Seems reasonable.
BUT, I am not one of the jackholes who post that stuff on Facebook and Twitter.
The sad reality is, the more painful you make it to escape your requests to spam my friends about your app or even make me have to dismiss it too much, there are dozens of competitors who I will gladly try. The odds are very good I am using your app because I became too annoyed with one of your competitors.
I like you, but I am not in the least very loyal to you.