The site-wide bounce rate seems to be a metric that tells you as much as the average speed of a car in US. There`s basically no god and no bad overall bounce rate, as it involves lots of various pages, obstacles and individual specifics. High bounce rate may be absolutely normal for a one-page site where multiple page views are not registered unless the page is re-loaded, for affiliate websites, etc. Even for individual pages the high bounce may mean a lot of contradictory things: perhaps, your page is bookmarked, or answers the search query so perfectly that there`s no need to continue researching; on the other hand it may point out some navigational issues, confusing design, or content actually irrelevant to the query.
In your case it`s totally normal to have high bounce rate from posting articles on social media; as for individual pages - I`d recommend you to check if each winning page is ranking for proper keywords and really answers to what a user may be after. Have a fresh look at the pages to see if they really presuppose any further actions and arouse interest in checking anything else on your website. Check if it`s easy to navigate from any of your pages (both back and force), and finally, just in case, make sure you have properly implemented the tracking code into all of your pages, and the stats are actually accurate.
