About 3 years ago now, we were working on a site for a client and came up with the idea to merge their Facebook and Twitter feeds with the news posts on their site to keep things feeling fresher for longer. Since then I've rebuilt the bloody thing 4 or 5 times so I finally decided to tidy it up and bung it into a plugin. What is it? The "Social Stream" grabs the latest Twitter and Facebook posts and merges them with posts on your WordPress blog. The idea is is that if you don't post regularly,…