What are some alternatives?
When comparing Swoop and Sonobi, you can also consider the following products
BuySellAds - BuySellAds.com Online Advertising Network
Adform - Adform is an ad tech partner for media agencies, trading desks and publishers.
MyBuys - MyBuys provides coordinated, cross-channel personalization services for Display Ads, Email and Websites
Newsmax Feed Network - Newsmax Feed Network is a fast, easy and inexpensive way to reach new customers through targeted content streams.
BlogHer Publishing Network - BlogHer Publishing Network is a premium ad network for bloggers who create excellent content and conversations with women.
CPMStar - CPMStar is an Ad Network providing advertising solutions to the gaming industry.