There is no one answer to this question as it depends on the jurisdiction in which the copyright infringement occurs. Generally speaking, however, copyright can be obtained over blog content if it is published on a website or through social media.
This is because blogs are typically considered to be publications, which makes them subject to copyright law.
If you believe that your blog has been illegally used without your permission, then you may want to consider taking legal action. There are a number of options available to you, such as filing a copyright infringement lawsuit or filing a complaint with the appropriate online platform.
However, it is important to remember that filing a lawsuit may be costly and time-consuming, so it is important to do your research first before deciding whether or not to take action.