You can use the application iFound24 for selling articles, for searching and buying articles or for your personal advertisement to reach millions of users.
You can categorize an advertisement multiple times and if any user is interested in your advertisement, you will get a notification immediately.
You can even mark categories and get notifications if any user displays your marked categories.
The quantity of your categories you can mark is unlimited and you can cancel them very easily.
After you turn on your advertisement, you can choose the place by getting marked the advertisement or global acting and reach millions of users at the same time.