First intent of these changes became known in may, but the update only happened recently. Some popular Twitter clients, for example, Talon for Twitter were already adapted to the new rules of the game.
Twitter the other day, still decided symbols in messages became more. It seems to be the same figure 140, but the social network has changed the logic of counting. Now do not count links to meadiafire, polls, quotes, and characters in nicknames of other participants of the service.