As I’ve explained in earlier pieces, I periodically post “most popular” lists of websites (and books) that I think educators might find useful. Of course, there are a number of ways to gauge “popularity.” I just view these lists as opportunities to check-out some new sites, and find it interesting to see which ones might be particularly “popular.”

Today, I’d like to share about two new applications that I’m adding to my post on how to find The Most Popular Links Being “Retweeted” On Twitter.

The first is Topsy, which lets you identify the top 100, top 1000 and the top 5000 links to sites that are being retweeted. Thanks to TechCrunch for the tip.

The other is more expansive than just Twitter but, for lack of a better place to put it, in adding it to the “retweets” list. It’s called Splurb, and it ranks links based on their popularity among several social networks — including Twitter. Thanks to Mashable for the tip.