If you’re a Christian, you’re an ambassador for Christ (2 Corinthians 5:20) and you should be a good representation of Him. Your lifestyle should reflect Him. Reflect is to to make manifest or apparent: to show. When people see you, they should see Christ.
Social media is a great way to spread the Gospel, but you shouldn’t just have a form of godliness on social media, your lifestyle should reflect what you post. Someone may profess Christ, but that doesn’t mean they’re a Christian. (1 John 2:6- Anyone who says he is a Christian should live as Christ did.) If you profess Christ, your lifestyle should as well.
A couple of months after I got saved, I and my friend decided to go to an Alpha cookout because we were hungry. It was honestly a dumb decision because we knew that people would be turning up. When we got there I felt so uncomfortable because so many people were drunk, girls were twerking and I just knew I didn’t belong there. I saw so many people I knew and I immediately felt convicted. Some of them were people that followed me on Twitter and I thought to myself “How can I tweet about God and then be at this turn-up?”
“Why would I be at a turn up if I gave that lifestyle up?” “How can I represent Christ if I’m joining people that are doing ungodly things?” “How can unbelievers see Christ in me if I’m doing what they’re doing?” I didn’t drink or smoke, but I knew I had no business being there. (2 Corinthians 6:17- Therefore, come out from among unbelievers, and separate yourselves from them, says the LORD. Don't touch their filthy things, and I will welcome you.) I do believe that God wants us to minister to unbelievers, but in this situation, I wasn’t going there to minister to them. We ended up leaving shortly after we got there and I made a mental note that I wouldn’t be in that kind of environments anymore.
People are always watching, whether you believe it or not. Once you proclaim that you’re a Christian, people will start looking at your every move. They want to see if you’re really living as a Christian should. You don’t want to ruin your witness doing things that the unsaved do. I’m not saying that as Christians we can’t do anything, I’m referring to sin. If you’re doing what unbelievers do, they’re not going to take you seriously. For example, if I’m witnessing to an unbeliever that they shouldn’t steal, but they just heard me cussing someone out on the phone, why should they listen to what I’m saying?
(Matthew 5:14-16- You are the world’s light—a city on a hill, glowing in the night for all to see. Don’t hide your light! Let it shine for all; let your good deeds glow for all to see, so that they will praise your heavenly Father.) If you’re blending in with the world how will anyone know that you’re a Christian? How can you help someone come to Christ if your light is dim?
I’m not saying that everything you post has to be about Christ, but if you’re posting about Him, your life should reflect Him.