The popular verse Ephesians 4:29 tells us to build each other up instead of tearing one another down. The word "unwholemsome" in this verse refers to that which is rotten or putrid, such as rotten meat or fruit. When we allow words to come out of our mouths that are unwholesome or tear someone down, those words are like rotten meat. Just plain nasty! The verse goes on to say that our words are to "edify" or build up others. We should only speak words that are positive and build others up. When we become Christians it is no longer our nature to speak unwholesome words. Christ set the example for us by never allowing anything but words of edification to come out of his mouth.
So then you might ask: "If I text or Facebook something is it the same as saying?" Of course it is! Proverbs 23:7 says that whatever we think within ourselves, we are. Also God knows our thoughts so when we think unwholesome words then its the same as saying it to Him. If we wouldn't say the things we text or Facebook to someone's face, then we shouldn't be saying it at all.
Prayerfully consider the words you use. Do you build people up or tear them down? Are you a positive person or always negative? Do you use avenues such as texting and Facebook to tear others down, gossip, etc? Ask God to search your heart on these matters. If you are using these sources as means to tear others down, gossip, etc., then I suggest you separate yourself from them. It's not only driving a wedge between you and the people you are talking about or against, it's driving a wedge between you and God!