It’s finally starting today any photos, videos, polls and quoted tweets included promoted tweets created using Twitter’s Ad dashboard still count only 140-character limit. When first if a brand posts a tweet organically then runs it as a Promoted Tweet, while media attachments won’t count, giving the brand more room for text in its ad. According to Twitter’s updated developer documentation, still tweets are limited to four photos or 1 GIF or 1 video.
Now still Twitter count only the 140-character limit (at least for now): usernames in replies, links and hashtags. But when usernames replies that won’t count against the 140-character limit for long. If you are starting a fresh tweet with someone’s Twitter username, that will be considered a normal, non-reply tweet, and the username will count against the 140-character limit.