Calls to Action on Twitter can be effective . Just try

You ever feel that you can use "call to action" in your tweets. Its an experiment but you should try to increase your engagement? 

#1: Ask for a download

If you want to promote your new product that is available for download. Make your tweet & ask people to download.Give people clear direction and incentive to click on the link you provide in a Tweet. Use hashtags and @handle mentions sparingly to keep clicks focused on one action: downloads. You can create a sense of urgency by including a deadline. 

#2: Ask for a Retweet

Include valid reason to retweet your messages. Use the word ‘Retweet’ instead of simply using ‘RT’ as the bottom performing Promoted Tweets. Use 'Retweet' at the beginning instead of at the end of the Tweet. Keep formatting clear and simple so people know exactly what you want them to do: share your message.  

#3: Ask for a follow

If you want to extend your reach to new audiences on Twitter? It can be as simple as asking for a follow. Highlight the exclusive content you are offering. For example : Check what goes on behind the scenes Or Offer some prize

#4: Ask for a reply

Want to increase a conversation with Twitter users? Ask a question & give people some motivation to engage 1-on-1 with your tweet.

Get users interested by getting personal in your tweets. Always use a conversational tone to humanize your campaign & make twitter users feel comfortable responding to you via an @reply.

To maximize the responses you get, combine the question with a contest or other exclusive incentive.

Reference: Twitter Blog