The changes are generational, and to some extent preceded Twitter. If you went back 10 years, even mid-day, there were visibly more angry young men standing aro

The changes are generational, and to some extent preceded Twitter. If you went back 10 years, even mid-day, there were visibly more angry young men standing around. You didn't have the theater presence that is building up now, or the pedestrian traffic coming from the direction of 5th - which used to mark a clear boundary for mid-Market, but isn't nearly as much so now, as the retail presence has made visible changes more recently, and the traffic patterns have changed with it. The inner parts of the TL aren't likely to change soon - as with the Mission and SOMA areas, the old population is going to stick around even as the neighborhood is changing around them. The gentrification of those other neighborhoods had its genesis in the dot-com era, and some 15+ years on, it's still nowhere near complete.