As you normally tweet you can still change it to direct message I think that is more respectful and it has a limit of 140 characters.
Note: This direct message can only be done between the user and the follower.
Below are some easy steps on how yo send direct message on Twitter.
First visit www.twitter.com and then login to your own account.
The person must be following you before you can be able to send direct message to.
At the top right side of that page click on the mail button.
After clicking on the mail button now choose New message.
Now insert the username of that person in the box being given to you and then click send message.
That is all you need to do don’t forget to drop your comment below thanks.