Foursquare just open sourced their 100m point of interest dataset! Some notes on poking around with it using DuckDB (it's Parquet files on S3) 
Simon Willison’s Weblog
Foursquare Open Source Places: A new foundational dataset for the geospatial community
I did not expect this! [...] we are announcing today the general availability of a foundational open data set, Foursquare Open Source Places ("FSQ ...
