What is Reddit?
I don't really think I can explain it any more quickly or well as CGP Grey does at:
https://www.youtube.com/watch?v=tlI022aUWQQ
But since you are reading this, I'm guessing you didn't want to click on the video link and watch the video.
Reddit is almost like the old "town square" or "forum" of old where people come together and talk about whatever they want to talk about. Some people are over there telling stories about the fish that got away, and other people over there are talking about whether the mayor is doing a good job or not.
But with the Internet, there ARE people out there with interests similar to yours. There are discussions (sub reddits) going on about every sports team, every profession, every country in the world, all major cities, fans of "My Little Pony", and even some things that would NOT have been discussed in public.
Reddit has LOTS of people's interests from around the world. Lots of people are interested in human bodies, especially unclothed human bodies, particularly unclothed human bodies interacting with each other. There is also that on Reddit, which brings me to another important point.
NSFW means NOT SAFE FOR WORK. You are going to see things that you would not want your boss to walk in on. NSFL means not safe for lunch, and might make you throw up. If Reddit warns you "are you over 18 and comfortable seeing adult material?", you might want to be in a very private place, using an incognito window, or just say "NO".
Why am I telling you about Reddit? Because there are many, many very interesting conversations, and what is most amazing is that the messages can be voted on, for being more interesting, so the most interesting stuff rises to the top. The messages can also be commented on, and the comments can be voted on, so more or less, the best things rise to the top.
So, if you know that there is a subreddit with Life Pro Tips, giving you suggestions on how to live your daily life better, you can go to http://www.reddit.com/r/lifeprotips and see the messages. But even better, you can hit "top" and see the best tips of the week, month, year, or all time.
So using the "top" feature you can get the most adorable animal pictures from http://www.reddit.com/r/aww or the best photographs of nature at http://www.reddit.com/r/Earthporn, etc.
Basic tip bonus:
Use good email subject lines to improve your communication.
Try to get your key point in the subject. "Hey" or "Read this" are not nearly as good as "Hey - do you want to get together this weekend" or "Read this piece about the current political situation in Argentina".
If you use good subject lines, people will get the majority of the message in subject line, and be able to respond to you more efficiently. "Call me" is never as good as "Call me about the Ferguson Account - they may be cancelling".