CNET: Twitter wants to know your birthday — but will you let them? The social networking service said with the new feature, users are now able to share and celebrate their birth date along with other users, complete with colorful animated balloons on that special day. Users can opt whether to share their B-day with the public, their followers, who they follow or “only me.” The feature is Twitter’s latest attempt to adjust its service to attract more people, and potentially appease Wall Street by bolstering its advertising revenue. Twitter has struggled to stand out from the shadow of its larger competitor Facebook.