I recently spoke with a Google person - an agency lead, at a Google seminar about this matter. It is not about SEO tricks. There are too many websites out there and Google need the support of the SEO community to help those websites align with Google standard so Google can ranks them better and more useful to searchers. This is an ecosystem and SEO commun... (more) The answer is surely Yes, sudden growth of content may potentially cause Google to penalize your site. Even if your content is authentic, sudden change of major content will make Google suspicious that something "dark" is going on. All the experienced SEO professionals I know treat this issue very carefully.
>what size changes trigger this penalization -... (more)
As for social media platform, LinkedIn is the best to start with, as it is the social network for "serious" entrepreneurs. You placed your FB, Twitter, Blogger icons far deep in the bottom of the site - let's bring it up above the fold. Reddit is also a good platform for your type of business. Facebook is not much for B2B, and Twitter is more for news.