Visiting your Facebook news feed can feel like a chat with parents eager for grandkids -- it's sometimes a flood of engagements, weddings and baby photos. Whether you enjoy it or not, that not-so-subliminal messaging is about to get more prominent with a US trial for promoted posts among everyday users. Just as with earlier deployments, American socialites can click a link to push a given post higher in others' news streams and get feedback on just how many have taken a peek. The testing is limited to those with under 5,000 friends and subscribers to keep the cele
