Part of that last update was an effort in that direction. I'm definitely a fan of pull-based curation; however, we didn't find much evidence that people were looking to use it. Presentation is an issue too. insomniasexx has been working on a redesign, and in it she has a follow icon, which reveals a drop down list of things that can be followed. But, even then, things get pretty complex with such a schematic. Consider if I make a post linking to space.com, tagged #space and #mars: There is also the issue that some people like to use personal tags for specific content. That is, I might want to use the tag #music.mk specifically for music that I want other people to hear, but not for articles that relate to music or the music industry. Of course, I could make #musicilike.mk. But, I think personal tags are more likely to be followed when they aren't created for every post, as they then suggest that the author is doing something with special intent.
And that doesn't include a community tag. mk
mk.space
mk.mars
mk.space.com
#space
#mars
space.com