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What is the risk of an app where you can make in-app purchases?
If you are not aware that the purchases involve real costs, you credit card can be seriously plundered. This is a problem that often arises when children play a game on their parent's smartphone.
When you download an app, you remain logged in for 15 minutes. During that time, children can still buy other apps or make in-app purchases without needing to re-enter their parent's password.
To which online encyclopaedia can everyone contribute?
Wikipedia
But be warned, this can lead to offered information that is not always reliable. It is interesting to know that every topic on Wikipedia has a discussion page (Talk) at the top left corner. There you can see which discussions have been held or which improvements the topic has undergone.
What is RSS?
RSS is a web standard through which website updates can be communicated. You can subscribe to an RSS-feed from a website to keep up to date on the latest changes.
RSS stands for Rich Site Summary or Really Simple Syndication.