Twitter:

In September, we launched a test that expanded the 140 character limit so every person around the world could express themselves easily in a Tweet. Our goal was to make this possible while ensuring we keep the speed and brevity that makes Twitter, Twitter. Looking at all the data, we’re excited to share we’ve achieved this goal and are rolling the change out to all languages where cramming was an issue.

As a result, your timeline reading experience should not substantially change, you’ll still see about the same amount of Tweets in your timeline.

Twitter says it probably won’t affect your timeline much but that depends entirely on who you follow. I expect my timeline will explode in size.