I have to agree with GhoooosT,being single is a blessing . You must first have that one on one with God, and when he is ready to share you he'll send someone.
It's about God's timing, you don't want to be pre occupied in finding someone, have fun being alone,join some ministries at your church, get involve. If you occupy your time in doing God's will,he will bless you with your hearts desire.
As for online dating,.....well, it's best you patiently wait on God and not orchestrate ways in finding someone, anyone can write and say they're a Christian,quote scripture on their profile,but it's by their fruits and their daily walk with God, that you can judge their true character.
Have patience and wait on the Lord, Trust in Him and He ( not the click of a mouse ) would lead you .
Online dating probably works but for me trusting in him and being patient makes it more exciting, if I do online dating,I'd probably make my choice by appearance.
Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord. 1 Corinthians 15:58