if you use developer features of the services , including but not limited to twitter for websites -lrb- https://dev.twitter.com/web/overview -rrb- , twitter cards -lrb- https://dev.twitter.com/cards/overview -rrb- , public api -lrb- https://dev.twitter.com/streaming/public -rrb- , or sign in with twitter -lrb- https://dev.twitter.com/web/sign-in -rrb- , you agree to our developer agreement -lrb- https://dev.twitter.com/overview/terms/agreement -rrb- and developer policy -lrb- https://dev.twitter.com/overview/terms/policy -rrb- .