Contact the author via Social Media
It is also possible to contact some authors for a copy of their work on social media, like Twitter or LinkedIn. Some people also use the hashtag #icanhazpdf on Twitter to request other users for the full text of a paper. Be aware though that not all publishers allow free distribution of their journal articles.
Contact the author via a platform
When an author shares his/her publications via ResearchGate, Academia or Mendeley, create a free account on these platforms and try to contact the corresponding author for a personal copy. This is allowed under the fair use agreements.
Contact the author directly
It is also an option to contact the author directly through the contact information mentioned in the article.