There is such a thing as something thats too popular to be retweeted/reshared on social media. If you’ve seen something appear in your stream several times, think twice before you post it yet again. Perhaps your followers aren’t following those same sources, but they probably are. If they’re following you, they probably have shared interests and there’s a good chance that they’ve already seen that cool thing from that popular blog that you’re about to re-share.
There are some sources which I’d argue to say probably never need to be retweeted or reshared unless the article was just posted in the last hour. TechCrunch and Mashable come to mind. There might be other sources depending on your industry.
One of the complaints I hear from folks is that they find social media sources to be too cluttered and noisy. Think before retweeting/resharing something that’s popular. Are you adding value?