07-13-2011, 06:56 PM
Private proxies are your own personal proxies. Shared proxies you're sharing with thousands of other people on the internet. These people are using them for Scrapebox, Xrumer, Mass mailing, etc. Most of the shared proxies are a lot slower than private proxies and they get banned more quickly due to the fact so many people are using them. Wordpress blogs have an anti spam plugin called askimet that filters out I.P.'s that have been known to spam. If you have 1,000's of people using the same proxy and blasting comments to that blog, your comment is automatically caught in the spam filter when using that proxy.