Although each page and platform is unique. Here is a rough guide to posting on social media platforms. We can see from the graphic below that it is acceptable and recommended to post often and numerous times a day to Twitter. Facebook is recommended at 3-6 times per week depending on content. Rather post quality content than posting for the sake of posting. Google+ is a slow platform and does not need to be updated as frequently.
Most of the algorithms social media platforms use look at the interaction the post receives in the first few minutes before it will increase its reach. This is how it identifies its reach. Make sure you post with the intent for the user to engage with the content.