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Affiliate Programs (11+ mil Opt-In Subscribers) 
Beauty and Supplies (4+ mil Opt-In Subscribers)
Boats and Accessories (4+ mil Opt-In Subscribers)
Books (6+ mil Opt-In Subscribers)
Cars and Accessories (11+ mil Opt-In Subscribers)
Christian (5+ mil Opt-In Subscribers)
Clothing (9+ mil Opt-In Subscribers)
College Students (13+ mil Opt-In Subscribers)
Credit Cards (13+ mil Opt-In Subscribers) 
Dating and Relationships (12+ mil Opt-In Subscribers)
Debt Consolidation (9+ mil Opt-In Subscribers)
Doctors / Physicians (7+ mil Opt-In Subscribers)
E-commerce (6+ mil Opt-In Subscribers)
Education (9+ mil Opt-In Subscribers)
Entertainment (12+ mil Opt-In Subscribers)
Finance (9+ mil Opt-In Subscribers)
Free Giveaways and Sweepstakes (8+ mil Opt-In Subscribers)
Gambling (8+ mil Opt-In Subscribers)
Grad Students (6+ mil Opt-In Subscribers)
General Male (19+ mil Opt-In Subscribers)
General Female (12+ mil Opt-In Subscribers)
Gifts (8+ mil Opt-In Subscribers)
Guns (5+ mil Opt-In Subscribers)
Health and Fitness (7+ mil Opt-In Subscribers) 
Hobbies (3+ mil Opt-In Subscribers)
Home and Auto Security (7+ mil Opt-In Subscribers)
Home Mortgages (9+ mil Opt-In Subscribers)
Home Owners (15+ mil Opt-In Subscribers)
Internet Shoppers (14+ mil Opt-In Subscribers)
Investments (11+ mil Opt-In Subscribers) 
IT Professionals (3+ mil Opt-In Subscribers)

Lawn and Gardening (5+ mil Opt-In Subscribers) 
Networking (8+ mil Opt-In Subscribers)
Magazines (4+ mil Opt-In Subscribers)
Medical Drugs (8+ mil Opt-In Subscribers)
MP3 (3+ mil Opt-In Subscribers)
Multi-level Marketing (MLM) Business Opportunity (15+ mil Opt-In Subscribers)
Music (16+ mil Opt-In Subscribers)
New Product Announcements (8+ mil Opt-In Subscribers)
Office Supplies (6+ mil Opt-In Subscribers)
Parents (16+ mil Opt-In Subscribers)
Pet Owners (18+ mil Opt-In Subscribers)
Realtors / Mortgage Brokers (1+ mil Opt-In Subscribers)
Sales Management (5+ mil Opt-In Subscribers)
Seniors Citizens (7+ mil Opt-In Subscribers)
Small Business Owners (17+ mil Opt-In Subscribers)
Software (8+ mil Opt-In Subscribers)
Spanish (Worldwide) (12+ mil Opt-In Subscribers)
Sports (12+ mil Opt-In Subscribers)
Surveys (8+ mil Opt-In Subscribers)
Systems Admin (3+ mil Opt-In Subscribers)
Tax Preparation (3+ mil Opt-In Subscribers)
Tobacco Products (14+ mil Opt-In Subscribers) 
Travel and Recreation (7+ mil Opt-In Subscribers)
Trucks and Accessories (6+ mil Opt-In Subscribers)
Vitamins and Nutrition (9+ mil Opt-In Subscribers)
Webmasters (5+ mil Opt-In Subscribers)
Weight Loss (9+ mil Opt-In Subscribers)
Web Design (8+ mil Opt-In Subscribers)
Web Hosting (4+ mil Opt-In Subscribers)
Web Security (3+ mil Opt-In Subscribers)