and it practically requires SSL/TLS (since all current web browsers require it)
Using encryption also help Google search rankings.
Getting signed certificates was so far complicated and expensive,
and now there is a free service that provides valid certificates.
"Let’s Encrypt is a new Certificate Authority: It’s free, automated, and open. In Public Beta"
"Let’s Encrypt has entered Public Beta. Invitations are no longer needed in order to get free certificates from Let’s Encrypt."