In solo queue, don't type. If someone is raging, put them on mute, and keep playing to the best of your abilities. No point in getting all frazzled over an asshat who types more than they click.
Also, jungle tips:
When jungling, if a lane get the kill in a gank: you may tax the lane. If you get the kill: don't tax the lane.
When taxing the lane, don't stay there for 3 creep waves.
If you think the gank won't get be successful and get the kill, don't be afraid to secure the kill. It's better to have 300 gold on you for sure than have none because "Ignite totally would have got it bro." (NOTE: If the laner ignites when the guys at 100 HP, don't take the kill, unless the laner has some mad HP regen.)
As a solo queue jungler, it's not your job to killsteal, but if someone is 0-7-0 at 15 minutes, it may have been better for you to take the kill anyways.
Don't be afraid to farm jungle! Ganks don't make the jungle, good timing makes the jungle.
Most junglers builds are super versatile; don't lock yourself down to one build. Every game is different, and every build you buy should be according to that game. This is not to say that having a basic set build isn't a good thing, it just means don't tunnel vision on that build.
If you're going to die in the gank, don't gank.
Dragon can be taken very early, so long as the proper requirements are met, such as:
-Opposing bot lane is dead, and the opposing mid lane/jungle is not overly ahead
-Dragon pit and surrounding areas are relatively ward free
-YOUR SMITE IS UP.
-The midlane and jungle are both dead, and bot lane is not overly ahead.
-YOUR SMITE IS UP
-YOUR SMITE IS UP
-You have a jungler capable of taking an early dragon, i.e. Nunu, Udyr, Nocturne, Vi, Jarvan, Zac, Sejuani (if lanes have high damage), Evelynn, etc.
-Did I mention your Smite HAS to be up.
If your team wants to go for Dragon/Baron and your Smite is not up, TELL THEM. Don't say "Uhhh, it's not a good idea." Specifically say, "Smite is not up."
If you snowball a lane, that does not mean you can not gank for that lane. Lanes that are winning can still get camped, and you still need to gank.
If you take a kill, don't stress it. If your supposed to take a kill, and don't get it, don't stress it (I'm looking at you Evelynn).
If you don't know how to play a jungler, don't pick them. Each Jungler is different, and each jungler requires different techniques and builds that cannot be taught well; the jungle is for adaptation.
Play for the team, don't play for yourself.
FINAL NOTES:
Jungle is, by far, one of the best roles to carry oneself in Solo Queue, simply for that fact that jungle decide what direction the game goes. However, it is also very risky, as the jungler is either outjungling, or being outjungled. There are very obvious, superior picks in jungle that are often better than others. While I personally greatly enjoy jungle Gangplank, I am aware that it is not up to par with the rest of today's junglers, and often do not choose to play it as such. Keep the fact that your decisions can win games, simply because you are the jungler, in your head, and take that into account when playing jungle. Have fun!