1) Newsgroup style filtering - As shown in the picture, you start out with an empty list and input whatever tags your alias wants filtered your way. Click on an individual tag in the drop down menu to only see that category, or click the all button at the bottom to see everything on your list. (list would be alphabetical)
2) Drop down follow list - works just like the topic filter list does, in alphabetical order of course.
3) Ability to create topics that grant no monetary gain to topic creator - numerous needs for this. If an organization isn't permitted to accept donations or profits in some manner, they would probably be required to use this. Same thing if developers just want to post some type of release log. The reward could be burned or blocked somehow.
4) Some primitive form of messaging - probably only work with two users who are online, but maybe pay to send offline messages using the blockchain.
5) Some type of profile page - with just a very limited allowance of text to post a link to an avatar and/or description of account. Even if it's only a few character allowance to link to a pastebin, better than nothing. The "follow" button would likely be located here.
6) Storefront integration -likely to come much later. Start off as a storefront for digital goods, then physical. Everything based on a reputation system, at your own risk type of thing.