I go on reddit. Besides the main ones (AskReddit, Gaming, TIL, etc. etc.) i go on /r/nba , /r/nba2k , /r/luciddreaming. And a couple others.
I send in plain white envelope safely!!! I have never had any problems! You can send in PWE as well to be fair.
Currently looking for a Kobe Bryant Auto, let me know if you have one! Also looking for current Pistons!