On the same day that Angie’s List had a successful public offering – raising over $100 million and finishing the day up 25 percent from the start of trading – Yelp filed for its own IPO. Part of some contagious IPO fever, says Paul Sweeting. Now, a lot of you won’t think of Angie’s List, a 16 year old company, as a tech startup, and you’re right. But the company has an interesting LinkedIn-like business model, even if it’s woefully un-techie and hard to scale. But Yelp’s got its own scaling challenges. I’ll be digging into the reviews and recommendations space in my Weekly Update. It’s one of the three big categories of social commerce (the others being group buying and shopping communities). And we’ve got some new research on local targeting, if you haven’t seen it yet.