Check out these stats from an article in The Wall Street Journal. Clutter isn’t just physical stuff. Be careful not to clutter up your smart phones with apps you don’t use, need or love!

• The number of apps the average smartphone user world-wide is expected to download this year – 37. (ABI Research)

• The number of apps expected to be downloaded world-wide this year – 36 billion. (ABI Research)

• The number of apps expected to be downloaded world-wide in 2017 – 136 Billion. (ABI Research)

• The number of minutes people spend on average each day on mobile apps in the U.S., as of December, compared with 72 minutes Web browsing – 94. (Flurry.com)

• The growth in time spent daily in the U.S. on mobile apps for the 18 months ended Dec. 2011, compared with 13% growth in Web browsing – 119%. (Flurry.com)

• The number of minutes spent daily on average on smartphone social-networking apps in the first quarter of this year world-wide, matching the time spent on games and more than any other category of apps – 24. (Flurry.com)

• The number of apps available in the Apple App Store – more than 650,000. (AppleInc.)

• The number of apps available in Google Play – more than 600,000. (Google Inc.)