Where to find help about life in Berlin?

I try to answer as many questions as I can with this website, but there are still many stones left unturned and many questions left unanswered. Here is how you can find help for the topics I have not yet addressed.

Ask the English-speaking community

You can leverage the support of the following communities and its members.

Toytown Germany - Forum. Less active than before.
Free Advice Berlin - Facebook group
Berlin EXPATS - Facebook group
Berlin4Beginners - Facebook group
/r/berlin - the main subreddit for Berlin. Make sure you read the rules before posting.
/r/germany - the English-speaking subreddit for Germany. They also have a lot of information and a large community that can answer your questions.
Quora - a general Q&A website
Expatriates StackExchange - Q&A website for expatriates

Ask the German-speaking community

If you can speak German, the following communities can also help you

Gutefrage - a popular German equivalent to Quora and Yahoo! Answers
/r/de - the main German-speaking subreddit for Germany. It's the largest German-speaking community on reddit
/r/FragReddit - a much smaller subreddit where you can ask questions in German
Jeder hilft jedem - the largest German-speaking Facebook advice group for Berlin. You must first request access by confirming that you have read the group's rules