Founded back in 2008, when social shopping was an exciting but unproven idea, ShopIgniter has been building its business among clients who have real-world goods to sell online, with a focus on Facebook. And like some of its rivals have recently, the Portland, Ore. company has raised more funding, an $8 million second round led by Silicon Valley venture firm Trinity Ventures with existing investor Madrona Venture Group participating.The new interest is because brands that had been focused on gaining Facebook fans in past years are now looking for what do next, as chief executive Matt Compton tells us in an interview today. For many Page owners, that means selling direct. ShopIgniter has a set of interlocking products aimed...