Louis Gray has prepared a list of 50 top startups that he is watching. Serving up the list in his ranking order  from one to fifty in terms of both interest and viability.

I am sure that if I ran this exercise 10 times, I would get a different list 10 times.

Louis explains: I looked below the uber-players such as Twitter, Facebook, LinkedIn, Groupon, Craigslist, Tesla, and others, with a focus primarily on Web services, with a tendency toward social, and apps I am using frequently. I am more than happy to share with you the list, and it would be great to hear those you think I left off the list and missed, or how this is off base. Thanks to Symbaloo being out there, I hope to keep similar lists updated on my Webmix.

Without further ado…

  1. Foursquare http://www.foursquare.com
  2. Spotify http://www.spotify.com
  3. Automattic http://automattic.com/
  4. Posterous http://www.posterous.com
  5. Blippy http://www.blippy.com
  6. SlideShare http://www.slideshare.com
  7. Tumblr http://www.tumblr.com
  8. TweetDeck http://www.tweetdeck.com
  9. Square http://squareup.com/
  10. Quora http://www.quora.com

  1. CinchCast: http://cinchcast.com/
  2. Sports Blog Nation http://www.sbnation.com
  3. Bit.ly http://www.bit.ly
  4. my6sense http://www.my6sense.com
  5. Thing Labs http://brizzly.com/
  6. Plancast http://www.plancast.com
  7. Seesmic http://www.seesmic.com
  8. Lunch http://www.lunch.com
  9. Gowalla http://www.gowalla.com
  10. DropBox http://www.dropbox.com

  1. Lazyfeed http://www.lazyfeed.com
  2. Hunch http://www.hunch.com
  3. Ecademy http://www.ecademy.com
  4. Xobni http://www.xobni.com
  5. Tweetmeme http://www.tweetmeme.com
  6. Feedly http://www.feedly.com
  7. Klout http://www.klout.com
  8. Justin.tv http://www.justin.tv
  9. Amplify http://www.amplify.com
  10. OneRiot http://www.oneriot.com

  1. Lijit http://www.lijit.com
  2. Echo http://aboutecho.com/
  3. MyLikes http://www.mylikes.com
  4. Outbrain http://www.outbrain.com
  5. DailyBooth http://dailybooth.com/
  6. Gist http://www.gist.com
  7. Soluto http://www.soluto.com
  8. Tungle http://www.tungle.me
  9. Qwotebook http://www.qwotebook.com
  10. Regator http://www.regator.com

  1. Untitled Startup http://www.untitledstartup.com/
  2. Twazzup http://www.twazzup.com/
  3. The Cadmus http://thecadmus.com/
  4. Branchr http://www.branchr.com
  5. Graphic.ly http://www.graphic.ly/
  6. BlockChalk http://blockchalk.com/
  7. FitBit http://www.fitbit.com/
  8. RockMelt http://www.rockmelt.com/
  9. Live Intent http://www.liveintent.com/
  10. Fabulis http://www.fabulis.com

Via @louisgray on Twitter