I am new to the site and still trying to figure things out. When a pic. appears on the right hand side under the 'Search' button, is that just a picture that the site randomly chooses from pics people post to their blogs? Sometimes when I click on them it will give the name of who posted it and sometimes I can trace it back to a blog but other times I can't. And if random from the blogs, how far back in time do they go?