There are a few ways to invest in a blog. One way is to buy a blogspot domain and set up a blog on it. You can also buy an existing blog and start using it to promote your own products or services.
You can also sponsor a blog and provide advertising or other support. Finally, you can contribute content to an existing blog and earn Karma points, which you can use to redeem rewards such as free products or admission to premium content.
The best way to invest in a blog is to contribute valuable content that will help the blog grow in popularity. If you have the time, effort, and skills necessary to write quality content, then investing in a blog may be the best way to achieve your marketing objectives.
However, if you are not a writer or do not have the time to write quality content, then buying or sponsoring a blog may be the better option for you.