I am not active on social media, but I know that I have to be active because of my job as a startup founder. Where and how should I get started?
The most important thing to understand is your audience, or rather your target customer.
In the beginning, it can be a bit overwhelming to all of a sudden tackle half a dozen social media platforms and do them all well.
Focus on just one or two platforms where you know your ideal customers are.
For example, if you're building a saas product for techies, get your butt on Twitter and engage with anyone and everyone who's commenting on related hashtags or other Twitter-ers. Twitterites.
If you're producing high-end physical products that look awesome in photos, post daily on Instagram and get people to oogle at your Instagram feed.
Of course you should still claim your business name on all the platforms just in case, but focus on a few.
Use tools like Hootsuite, MeetEdgar, IFTTT, and Zapier to help you automate some of the posting process.
Just don't cheap out on your content ;)