Yes, but some people call it spamming, don't know what the right to do.
Anyway, there is free eBook explain all the ways of marketing online.
well, there is many ways and many books, but i hope this book will be useful to you when you read it.
The Encyclopedia of Free Online Advertising II - Freebies - e-Books - The Encyclopedia of Free Online Advertising II - Designbuyers Shopping Store - Copyrights 2008