TweetDeck. On TweetDeck, you can click the magnifying glass and search for each of these hashtags and then add a column for them. I always have about 15 columns on my TweetDeck.
Speaking of PLPs and Twitter. For those who choose to learn via Twitter and want to document your learning in you PLP Doc, check out Twitter Curator Add-On. Here is a quick tutorial on how to use the add-on Twitter Curator Tutorial
Stay tuned for more share outs from TCEA as I dig through them!