One of their slogans is "Love Is The Movement" and they strive to encourage people to show love to everyone because you never know when a caring world could be saving a life. On the same note, a hurtful world could be ending one, so it's a reminder to watch our words.
For more info, visit their website: www.twloha.com
Recently, a book telling the story of how they came to be was published. Please check it out:

It can be purchased through the TWLOHA online store.