Saving your song in a compressed file format will have the best chance of success in sending with a social media messenger application.
As you have Studio One Professional, I would suggest using the MP3 option. Most online messenger applications including Skype limit the file size to several dozen megabytes.
For those reading this that have only Artist, you won't have the MP3 option unless you upgrade to Professional or buy the MP3 Add-On for Artist available in the web shop at (http://shop.presonus.com
Just a suggestion:
If you want to preserve all the quality of your original recording, you should use the WAV format, however that file will be very large (hundreds of megabytes). In that case posting to a private folder in your Gmail, OneDrive or similar account that can hold large files, then share it out to whomever needs to hear it.
WAV format is available to all Studio One licenses, Free / Prime, Artist and Professional.