There is no universal frequency for how often companies should post content on social media, as it depends on many factors such as industry, target audience and platform. In general, however, posting regularly can be beneficial to maintain a strong social media presence and increase follower engagement. It is important to strike a balance between posting enough content to keep followers engaged, but not overloading them with too much information. It is also important to consider the quality of the content, as it is more important to post relevant and engaging content than to post content too frequently.