It means that you 'like' the post, similar to the thumbs up from facebook.
Love
http://facebookcraze.com/tag/broken-heart-for-facebook/
its facebook
Facebook is a popular social networking website. There is no blue heart on Facebook but you can create a heart symbol in posts and comments by typing the "less than" sign and the number 3. A heart signifies love.
<3
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It means that you are accessing Facebook from your mobile phone.
just make it!
I Want YOU !!
Mugapphuthagam
biography
You cannot put a heart on your Facebook name, but you can put it on any facebook wall or on facebook chat, you can do it in 3 ways:Press ALT and 3 together, but only press the 3 which is on the number pad, not the one in the row, for this heart - ♥Press < and 3 together for a pink heart.Or copy this - ♥