Silicon Valley start-up Swipp says it has raised $3.5 million in funding from venture firm Old Willow Partners, an early investors in Groupon. It will use the cash to develop and launch its first products sometime in late fall. On the subject of what exactly those products will be, Chief Executive and co-founder Don Thorson was cagey. But it seems like he’s aiming to create a social network where it would be easier for consumers and merchants to analyze or make money from data than on say Twitter or Facebook.