The silver tier for the League of Legends can possibly be one of the most frustrating league to be in. There are mixtures of competitive players along with people who are tired of playing with trolls. I have figured a few keys to help overcome the trollness that the LoL community has at this silver level.
1) The most import key is to be very versatile. Meaning, don't call a position but simply state that you will fill the open position. Most of the time, people will call a role, just to trolled and someone lock in the same position. So rather than call and hope for the best, show the team that you will play anything and do well at it.
2)nice communication. The style of being (over) nice when it comes to communication in the LoL community is virtually impossible to find. Over and over do games get lost just in the first 15 seconds of champion selection. So when in doubt, attempt to be the mediator and try to control the tempers of your fellow players. Using the first key is also important to making this key work.
3)expect feeders. This is a general rule of thought. Most people dont intentionally run into lanes and just feed out of trollness. So maintain coolness and win your lane. Beat your lane and at any free moment, gank another lane and maintain the overall up attitude of the team.
4)never give up. We are in the tiers of MLG throwers. Keep the team focused and re assure them of potential throws and make the most of it.

Hope this blog helps
Micahman2
aka Micah Steiner