Is any sick among you? let him call for the elders of the church; and let them pray over him, anointing him with oil in the name of the Lord: And the prayer of faith shall save the sick, and the Lord shall raise him up; and if he have committed sins, they shall be forgiven him. Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much. (James 5:14-16 KJV)
Prayer is not just for healing. It is communication between you and God alone. I see that some people like to post their prayer request from sickness on Facebook, so that they can either pray an actual prayer for the person or just they feel sorry for the person. I hate to post a prayer on Facebook for everyone can see it for these reasons:
1) Every Facebook friends may not believe what you believe. Instead, post your prayer request to the specific group of friend(s), who is really going to pray for you.
2) Don't just ask your friend(s) to pray for your sickness without your input. God can hear your friend's request to heal you. But you must do your part for God to heal you.
3) We must accept what God gives us than according to our wishes. He knows the best things what we need.