Flamewars.net contains many examples of people justifying their commitment to
comments they have made on a blog posting.
Persuasion architects apply this principle by asking for a relatively minor,
but visible, commitment from you. They know that if they can get you to
act in a particular way, you’ll soon start believing it. For example, an
organization may ask you to ‘Like’ one of their products on Facebook to
watch a video or get access to particular content. Once this appears in your
NewsFeed, you have made a public commitment to the product and feel
more inclined to support it.