There are hundreds of thousands of inmates in California alone. It is estimated that 2.7 billion are incarcerated in North America. Being incarcerated for any length of time is usually tough on the individuals. Sure there is contact with others, but this is mainly with other inmates or the guards. Half of this prison population has some type of job to keep them busy.
Social opportunities are limited.
Talk is usually not allowed on the job and the guards prefer not to engage in any type of conversation with the inmates. During breaks or while locked down, conversations are with other inmates who share this long life. Contact with family, friends, and lawyers are occasional at best. Also to display a little compassion towards those incarcerated. Prisoners do not want to be pitied but want to have friends they can talk to and share their concerns and desires.