It would be fantastic if we could use "categories" in our feeds. Many people post about various topics: Shopping, Exploring, Romance, Clubbing. Wouldn't it be great if we could create topic categories?

These categories could then appear as links or buttons above the feed, for example:

[Shopping] | [Exploring & Sightseeing] | [Photography] | [My Love]

Free users could have up to three categories, while Pro users could have 10 or 12.