Twitter introduces mobile app promotion for two-tap downloads

Twitter introduced mobile app promotion in beta earlier this year to make it easier for app developers — and their advertising networks — to reach audiences through the social network.

Developers have the option of inserting an existing app icon or creating a new one, and if the user already has the app installed he can open it from within Twitter itself.

The interesting thing about the new ad model is that it is based on a cost-per-app-click model, so advertisers won’t be charged until the user clicks on the link or opens the app through Twitter, thus earning a positive metric — all of which can be tracked from the Twitter advertising dashboard.

While Twitter ads may be intrusive, they’re a necessary evil for a free service that, like other social networks, rely on advertising to grow.