I believe that if one has real faith one will be compelled to share the Gospel, or in general share one’s faith in Christ–the Gospel message–in whatever way it is most expedient and fruitful to do so. For some, this will be face to face, for some via social internet, for some via artistic expression, etc. I think that Stephen Curry shares his faith through his on court actions as well as in his tweets and his endorsements, for example. We don’t all have the audience he has, but must do what we can, when we can. And to answer your question, to never share one’s faith at all seems gravely disobedient of Christ’s instruction.