Are you looking to engage in work for hire or be hired for full-time? If you're looking to be hired full-time, you'll have a much easier time talking to recently startups that don't already have a growth team. The best way to cover a lot of ground is to introduce yourself to VC Recruiters like Dan Portillo at Greylock. Did the company you worked for get funding?
If so, talking to your previous company's VCs and asking them for intros to specific portfolio companies that you think you could help, adds more credibility than a hundred blog posts.
If you're not looking for work and you simply want to stay on top of the conversation with the best in the business, look no further than Twitter. There are amazing growth people from the fastest growing companies in any sector on Twitter who are active, friendly and post great content.
Seriously, Twitter is totally undervalued when it comes to building relationships. One of my relationships with one of the most valuable investors in my angel round was built initially entirely from a Twitter conversation.