"How can I make my app viral" seems like asking yourself "How can I make someone love me".
You don't want to make users want to spread your app, you want them to want to spread your app.
The "Invite people" forms are a really bad way of doing things IMHO. It's like asking your wife/hubby to fill in a form detailing how much she loves you.
I'd also say a good strategy is to give users something for free, that they think should cost money - they'll be sure to tell their friends off their own back.
You don't want to make users want to spread your app, you want them to want to spread your app.
The "Invite people" forms are a really bad way of doing things IMHO. It's like asking your wife/hubby to fill in a form detailing how much she loves you.
I'd also say a good strategy is to give users something for free, that they think should cost money - they'll be sure to tell their friends off their own back.
Still good ideas in the original article though.