Here is an interesting service which i am going to suggest everyone who runs a website, blog or a community forum. This is applicable to all the services where in you get feedback from your readers through a form and using which Spammers also send you SPAM. This service is offered by Solve Media which offers you with a SPAM Protection service by showing CAPTCHA messages on your forms and in return allowing to earn money from the same. The concept is very simple whenever you find a CAPTCHA, either a combination of a few alphabets, numbers or some question, but what if the same is some catchy tag line of a brand which is sponsoring you to display the same?
SolveMedia makes the boring CAPTCHA into a TYPE-IN which is branded message(human authentication). Your readers would submit the messages the very same way but this time it’s not some unrelated words which can confuse too, but some brand names. You can always implement the Disqus commenting system on your blog or implement the WordPress antispam plugins.
Here is a sample report which shows you earnings for one account where the CAPTCHA is installed on a WordPress based blog. Around 450 times the comments form was submitted for which there was some revenue. This might be a very less revenue, but considering the fact that you are using this service to eradicate spam from your sites and still earning something out of it, this could be a good option. Probably a few dollars a month from this service can help you cover your web hosting bills and also ensure that your site is free from SPAM. You can also try out different ways of implementing this service on your forum, or jobs board listing or may be a classifieds site where there is a lot of user activity and where you can expect readers to submit forms.