I recently saw this Lifehacker post on Quotabl.es, which is a standalone website that will collect and keep quotes that you like. It allows for tagging quotes and the [now-obligatory] ability to share on Twitter or Facebook.
But to/for me, this is the wrong approach! Why hoard quotes that are meaningful to you? Aren’t they important enough to share with the world? Just like no plan survives contact with the enemy, no idea spreads in a vacuum.
Tell people who you are, tell them what inspires you, tell them what moves you. Don’t store ’em in some antiseptic webapp: claim them, publish them (meaning someplace public, where people will find them), and share them.
(I think even Lifehacker understands things my way.)