Not PR Vkontakte, but just my thoughts and advice, for example, as a webmaster. I observe how the implementation of services in the form of these applications is becoming more and more “fashionable” practice. You can see the total number of Vkontakte applications
here (you need to be registered). Over a year ago, they almost did not exist. Now there are 1023 of them (“common”, that is, not games - 260). In a year there will be 5 times more of them (my assessment, who thinks more precisely - correct). The direction is just beginning to gain popularity. Even if we throw out gaming and entertainment from them (of course, the majority and they are the most popular, the 95% rule still works), there are still very necessary and useful ones.
Well, for example, offhand: Internet radio, payment systems (Webmoney, Roboxchange), icq-clients, sending SMS. There are a lot of applications duplicating the functionality of some useful sites: Last.fm, 4konverta.ru, flea market mobile mobad.ru, all sorts of horoscopes / organizers / weather forecasts / TV programs. There is even a keyboard simulator!
Given the huge audience of this largest social. networks in runet, as well as a large number of contact people, you can draw your own useful conclusions.
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Already have a website / resource with some useful unique functionality? Consider whether it is possible to implement a kind of duplicate in the form of an application for Vkontakte. If yes - I can congratulate you. You have found another way to increase the size of the permanent audience of your project.