Talking is a great aspect of the game. When playing in freerolls especially newbies tend to talk kore frequently. You can use chatting just to meet friends, or to help your game. It may also hurt your game. Here's an example of each scenario:
To help your game: One may use misleading raging comments to pretend one is tilt. Usually people read that angrier tilt players, therefore their range will be maximized, and you will be playing out of position. However, to use this to your advantage, you can keep the same range and keep betting seemingly unrational bets (but in reality you are trying to induce a call from your opponent). This will result in your opponent playing out of position, and ultimately to their defeat. This best works vs. weaker emotional players, or chatterboxes (usually found in lower stake tables).
To hurt your game: One may lose focus while chatting. This usually leads to one calling more out of position, which is quite similar to the opposite of the last example. One may also give reads while chatting. Smart poker players take any clue they can get to find a read on their opponents, even on a psychiatric level. This is why example 1 may be an asset to your game, because your deceiving your opponent, leading onto him false deductions.
Hope this helped, good luck at the tables.