Next time you're feeling nostalgic and want to peruse old Twitter posts -- such as in 2006, when Pluto was demoted to dwarf planet status -- you might want to pay Topsy a visit. The social search engine, which could previously look for posts up until 2010, has expanded its archives to include tweets from as far back as Twitter's birth in 2006. Simply input terms in the search box, and you'll find their newest and oldest mentions on the site. Even better than that, you can use the site to read every single tweet a user has ever posted by querying "from:yourusername," making it easy to look for the first time you tweeted about Lady Gaga's wardrobe. Before you run off and facepalm at your old tweets, though, check out @engadget's first one by Ryan Block after the cut.