Online communities (e.g. Dropbox and HackerNews, Discord and Reddit, Netflix and niche forums)
Offline communities (e.g. Etsy and craft fairs)
Retailers/malls (e.g. Hipcamp and REI, Pinterest and Apple stores, Snapchat and malls)
High schools (e.g. Snapchat)
College campuses (e.g. Tinder)
Business schools (e.g. Morning Brew)
Startup offices (e.g. Lyft, Wealthfront)
Transit hubs (e.g. Uber and CalTrans station)