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Categories are tags for topics that come up often. A given category appears in the main feed whenever there are new relevant articles. You can get custom alerts for categories just like any other tag.
The Tag Cloud shows the hashtags that are currently trending, with the most popular ones appearing near the top in the largest font.
To follow a hashtag, tap on one anywhere to navigate to the tag page showing the articles for that tag. Then, tap the bell in the upper right to set your custom alerts for that tag.
Lux indicates how many people have upvoted a story to indicate that it's important, whether good or bad news.
You can open a full article in a browser window by tapping the short link in the bottom left of any article listing or by tapping the three dots in the upper right and selecting "Open in browser" from the menu.
With the Luxihd app on your device, go to the article you want to share in your browser. Then tap the Luxihd button from the share menu and tap submit!