Posts per day and new authors can be retrieved from each subreddit programmatically; each post is timestamped, so historical time series can be generated by iterating through the posts. Posts per day are used here rather than comments per day. Each post on Reddit can have a number of associated comments in a one-to-many type relationship. However, examples exist where huge numbers of comments are generated that are unrelated to market activity; for example, sometimes people give away small amounts of cryptocurrency to everyone who comments with their public blockchain wallet address; this causes a huge spike in comments (wavelet coherence between comments per day and price were also generated, but as was expected showed less significant relationships than posts per day and price).
There is no defined limit to invest in cryptocurrencies, just like there is no minimum limit to invest in stocks. However, there is some difference. If you do not wish to buy an entire cryptocurrency, you are allowed to buy small units of it. Once registered, a user can add money to his/her wallet and use that amount to place an order for

— Ivelisse Porroa-Garcia is now director of government affairs at Ferox Strategies. She previously was policy director for the Congressional Hispanic Caucus.
— Meanwhile, Rover, the pet care site sometimes referred to along with its competitor Wag as the Uber of dog walking, has retained Mercury Public Affairs as its first outside lobbying firm. Mercury’s Mike McSherry, an alum of the RNC, Republican Governors’ Association and Labor Department, will lobby for Rover on tax and labor classification issues — a development that comes as the Biden administration has pledged to recognize workers dispatched by apps as employees rather than contractors. Gig companies are also facing new tax reporting requirements beginning next year, thanks to the coronavirus stimulus bill signed into law by President Joe Biden in March.