The Web site Is It Old? can save you from oversharing.
Think of it as the "Use by" or "Best before" date on a loaf of bread or gallon of milk. But instead of perishables, it tells you how stale or fresh a link is by how many times it has been shared on Twitter and how long ago the first share occurred. You'll get ratings that range from Old and Kinda OK to Super Fresh the congratulatory You're the first!
Just paste a URL into the the search bar and hit submit to determine the freshness of that link you're about to share with your jaded Internet friends and followers. And for those in the business of writing for Internet outlets, it can be a useful tool to see if an article or blog post you wrote has resonated with your audience.