The primary consideration for curating content is quality. You are acting as a filter for your followers, so aim to be a good one. Next you need to remember that if you’re a technology blogger, your fans have likely read the posts on the leading industry websites already. It doesn’t add much to your stream to share the latest article from Mashable or Tech Crunch because not only are they obvious destinations, they’ve also already been re-tweeted a couple thousand times already.
Your role is to be a content discovery agent. Some of the best writers on the net get fewer than 100 visitors each day, and it’s your job to find the best pieces from the best writers that no one else has ever heard of.